Soft, Chewy Oatmeal Cookies with Marshmallow Filling
If you love classic oatmeal cream pies, you’re going to adore this homemade version! These soft and chewy oatmeal cookies filled with fluffy marshmallow cream are sweet, buttery, and packed with warm cinnamon flavor. Sandwiched together with a smooth, creamy filling, they make a nostalgic treat that’s perfect for afternoon snacks, lunchboxes, bake sales, or sharing with family and friends.
The best part? You can make these homemade oatmeal cream pies with simple pantry ingredients. The cookies have a delicious brown sugar flavor, a tender texture, and just the right amount of chewiness from the oats. The marshmallow cream filling adds a light, sweet center that makes every bite irresistible.
Whether you’re recreating a childhood favorite or baking something special for your family, this easy oatmeal cream pies recipe deserves a place in your dessert collection.
And if you’re feeling creative, try adding chocolate chips to your next batch for a delicious twist!
Why You’ll Love These Homemade Oatmeal Cream Pies
- Soft and chewy cookies: Brown sugar, butter, and quick oats create a tender cookie with a satisfying chewy texture.
- Fluffy marshmallow filling: The creamy center adds sweetness and gives these sandwich cookies their classic look and taste.
- Simple ingredients: You probably already have most of the ingredients in your kitchen.
- Perfect for making ahead: Bake the cookies in advance and assemble them when you’re ready.
- Easy to customize: Add chocolate chips, extra cinnamon, or a little nutmeg for a different flavor.
- Great for sharing: These homemade treats are perfect for parties, holidays, potlucks, and lunchbox desserts.
What Are Oatmeal Cream Pies?
Oatmeal cream pies are sandwich cookies made with two soft oatmeal cookies and a sweet, creamy filling in the middle. They’re known for their chewy texture, warm flavor, and fluffy center.
This homemade version uses brown sugar, cinnamon, vanilla, and quick oats to create flavorful cookies. The filling combines butter, marshmallow creme, powdered sugar, and vanilla for a smooth, sweet consistency.
Unlike crunchy oatmeal cookies, these cookies are designed to stay soft enough to sandwich around the filling without crumbling.
Ingredients for Homemade Oatmeal Cream Pies
For the Oatmeal Cookies
- 1 cup unsalted butter, softened: Butter gives the cookies their rich flavor and tender texture.
- 1 cup packed brown sugar: Adds moisture, sweetness, and a delicious caramel-like flavor.
- ¼ cup granulated sugar: Helps balance the brown sugar and sweetness.
- 1 large egg plus 1 egg yolk: Helps bind the dough while the extra yolk contributes richness.
- 2 teaspoons vanilla extract: Adds warm, classic cookie flavor.
- 1½ cups all-purpose flour: Provides the structure for the cookies.
- 1 teaspoon baking soda: Helps the cookies spread and develop a tender texture.
- 1 teaspoon ground cinnamon: Adds warmth and complements the oats.
- ¼ teaspoon salt: Balances the sweetness.
- 2 cups quick oats: Give the cookies their signature oatmeal flavor and chewy texture.
For the Marshmallow Cream Filling
- 1 stick unsalted butter, softened: Creates a rich, creamy base.
- 1 jar (7 ounces) marshmallow creme or fluff: Gives the filling its fluffy marshmallow texture.
- 1 cup powdered sugar: Sweetens and thickens the filling.
- 1 teaspoon vanilla extract: Adds extra flavor.
- 1–2 teaspoons milk, if needed: Helps loosen the filling if it’s too thick.
How to Make Oatmeal Cream Pies
Follow these simple steps to make soft oatmeal cookies and a fluffy marshmallow filling at home.
Step 1: Preheat the Oven
Preheat your oven to 350°F (175°C). Line two baking sheets with parchment paper to prevent sticking and make cleanup easier.
Step 2: Cream the Butter and Sugars
In a large mixing bowl, beat the softened butter, brown sugar, and granulated sugar until the mixture becomes light and creamy.
This step helps create a smooth cookie dough and contributes to the cookies’ soft texture.
Step 3: Add the Eggs and Vanilla
Mix in the egg and egg yolk until fully incorporated. Add the vanilla extract and mix again.
Scrape down the sides of the bowl as needed to ensure everything is evenly combined.
Step 4: Combine the Dry Ingredients
In a separate bowl, whisk together the flour, baking soda, cinnamon, and salt.
Gradually add the dry ingredients to the butter mixture, mixing just until combined. Avoid overmixing, as this can make the cookies tougher.
Step 5: Stir in the Oats
Add the quick oats and stir until evenly distributed throughout the dough.
The dough should be thick enough to scoop onto the baking sheets. For the best texture, avoid adding extra flour unless the dough is unusually loose.
Step 6: Shape the Cookies
Scoop the dough into small, evenly sized portions and place them on the prepared baking sheets, leaving about 2 inches between each cookie to allow for spreading.
For sandwich cookies, try to make the dough portions similar in size so the finished oatmeal cream pies look neat and uniform.
Step 7: Bake Until the Edges Are Set
Bake for approximately 9–12 minutes, checking early because oven temperatures and cookie sizes vary.
The edges should look set while the centers remain slightly soft. The cookies will continue to firm up as they cool.
Let them rest on the baking sheet for about 5 minutes before transferring them to a wire rack.
Important: Allow the cookies to cool completely before adding the filling. Warm cookies can melt the marshmallow cream and cause it to slide out.
Step 8: Make the Marshmallow Cream Filling
In a clean mixing bowl, beat the softened butter until smooth and creamy.
Add the marshmallow creme and vanilla extract. Beat until the mixture is fluffy and well combined.
Gradually mix in the powdered sugar until the filling reaches your preferred consistency.
If the filling is too thick, add milk ½ teaspoon at a time, mixing after each addition. You may not need the full amount.
Step 9: Assemble the Oatmeal Cream Pies
Once the cookies are completely cool, spread or pipe a generous layer of marshmallow filling onto the flat side of one cookie.
Place another cookie on top and gently press until the filling reaches close to the edges without squeezing out too much.
Repeat with the remaining cookies and filling.
Step 10: Let the Filling Set
Arrange the finished oatmeal cream pies on a tray and let them sit briefly so the filling can settle.
Enjoy them immediately, or store them in an airtight container for later.
Tips for the Best Homemade Oatmeal Cream Pies
1. Use Softened Butter
Butter should be soft enough to press gently with your finger but not melted. Melted butter can change how the cookies spread and affect their texture.
2. Don’t Overbake the Cookies
The secret to soft oatmeal cream pies is removing the cookies when the edges are set but the centers still look slightly soft.
Leaving them in the oven too long can result in dry, crunchy cookies that are more difficult to sandwich.
3. Make the Cookies Similar in Size
Use a cookie scoop or measuring spoon to portion the dough evenly. Matching cookie sizes make the sandwich cookies easier to assemble and more attractive to serve.
4. Cool the Cookies Completely
This is one of the most important steps. If the cookies are even slightly warm, the marshmallow filling may soften too much and become difficult to handle.
5. Adjust the Filling Consistency
If your filling is too soft, gradually add a little more powdered sugar. If it is too thick, add a small amount of milk.
The goal is a fluffy filling that spreads easily but stays between the cookies.
6. Avoid Overmixing the Dough
Once you add the flour mixture, mix only until the ingredients are combined. Overmixing can develop excess gluten and make the cookies less tender.
7. Chill the Filling if Needed
If your kitchen is warm or the filling feels too soft, refrigerate it briefly before assembling the cookies. Let it soften slightly if it becomes too firm to spread.
Can You Add Chocolate Chips to Oatmeal Cream Pies?
Absolutely! Chocolate chips are a delicious addition to these homemade oatmeal cream pies.
For a chocolate chip version:
- Add ½ to ¾ cup chocolate chips to the cookie dough.
- Use semi-sweet chocolate chips for a balanced sweetness.
- Try mini chocolate chips for a more even distribution.
- Keep the marshmallow cream filling as written for a classic chocolate-and-marshmallow combination.
Fold the chocolate chips into the dough after adding the oats. Bake as directed, checking for doneness because the cookie size can affect the baking time.
Baking tip: If you want the cookies to remain easy to sandwich, avoid adding too many chocolate chips. A moderate amount gives you chocolate flavor without making the cookies difficult to handle.
Delicious Variations to Try
Cinnamon Oatmeal Cream Pies
Add an extra ¼ teaspoon of cinnamon to the dough for a warmer, spicier flavor.
Chocolate Chip Oatmeal Cream Pies
Fold ½ to ¾ cup chocolate chips into the cookie dough before baking.
Maple Oatmeal Cream Pies
Replace half of the vanilla extract in the filling with maple extract, using a small amount at first because maple extract can be strong.
Extra-Vanilla Cream Pies
Add a little extra vanilla extract to the filling for a more pronounced vanilla flavor.
Nutmeg Oatmeal Cream Pies
Add a small pinch of ground nutmeg to the dry ingredients for a cozy, bakery-style flavor.
Mini Oatmeal Cream Pies
Make smaller cookies and reduce the baking time as needed. Mini sandwich cookies are ideal for parties, dessert trays, and lunchboxes.
What to Serve with Oatmeal Cream Pies
These homemade oatmeal cream pies are delicious on their own, but they also pair wonderfully with:
- A cold glass of milk
- Hot coffee or a latte
- Hot chocolate
- A cup of tea
- Vanilla ice cream
- Fresh strawberries or sliced apples
- A dessert platter with brownies and chocolate chip cookies
For a simple dessert, serve one oatmeal cream pie with a glass of cold milk. For a special treat, warm one very briefly and serve it alongside a scoop of vanilla ice cream.
How to Store Homemade Oatmeal Cream Pies
At Room Temperature
Because the filling contains butter and marshmallow creme, storage recommendations can vary depending on the ingredients and the temperature of your kitchen. For the safest approach, keep the assembled cookies in an airtight container in the refrigerator unless the filling ingredients’ packaging specifically supports room-temperature storage.
In the Refrigerator
Place the assembled oatmeal cream pies in an airtight container and refrigerate for approximately 4–5 days for best quality.
Let them sit at room temperature for a short time before serving if you prefer softer cookies and a creamier filling.
Can You Freeze Oatmeal Cream Pies?
Yes. For the best texture, freeze the completely cooled cookies separately before assembling them, then prepare the filling when you’re ready to serve.
You can also freeze assembled sandwich cookies in a freezer-safe container, separating layers with parchment paper. Freeze for up to about 2 months for best quality.
Thaw them in the refrigerator and allow them to soften slightly before serving. Avoid repeatedly thawing and refreezing the cookies.
Common Questions About Oatmeal Cream Pies
Why Did My Oatmeal Cookies Turn Out Hard?
The most common reason is overbaking. Remove the cookies when the edges are set but the centers are still slightly soft. They will continue to firm up as they cool.
Measuring too much flour or overmixing the dough can also make the cookies tougher.
Can I Use Old-Fashioned Oats Instead of Quick Oats?
Yes, but the texture will be different. Old-fashioned oats are larger and chewier, while quick oats create a more uniform cookie texture.
For the softest, most classic sandwich cookies, quick oats are a good choice.
Do I Need to Chill the Cookie Dough?
Not necessarily. You can bake the dough immediately if it has the right consistency.
If the dough is very soft or the cookies spread too much during baking, refrigerate it for 20–30 minutes before baking the next batch.
Why Is My Marshmallow Filling Runny?
The butter may have been too warm, or too much milk may have been added. Try chilling the filling briefly or gradually mixing in additional powdered sugar until it thickens.
Make sure the cookies are completely cool before assembling them.
Can I Make the Cookies Ahead of Time?
Yes. Bake the cookies a day ahead and allow them to cool completely. Store them in an airtight container, then prepare the filling and assemble the sandwich cookies when you’re ready.
You can also make the filling ahead and refrigerate it in a covered container. Let it soften enough to spread before assembling.
Can I Make These Oatmeal Cream Pies Without Cinnamon?
Yes. You can omit the cinnamon if you prefer a simpler brown sugar and vanilla flavor. You could also replace it with a small pinch of nutmeg.
How Do I Keep the Filling from Squeezing Out?
Avoid adding too much filling to each cookie. Spread it in an even layer, leave a little room around the edges, and gently press the top cookie into place.
If the filling is too soft, chill it briefly before assembling.
Are These Cookies Good for Lunchboxes?
Yes, they’re a fun homemade treat. However, because of the butter-based filling, keep them refrigerated until needed and use an insulated lunch bag with an ice pack if they will be away from refrigeration for an extended period.