Tender, juicy steak slow-cooked with colorful bell peppers, onions, garlic, tomatoes, and zesty Tex-Mex seasonings. These Slow Cooker Steak Fajitas are an easy, flavorful dinner that requires minimal preparation and fills the kitchen with incredible aromas. Serve the tender steak and vegetables in warm flour tortillas with your favorite toppings for a satisfying family meal.
Ingredients
For the Steak Fajitas
- 2 lbs (900 g) flank steak or skirt steak
- 2 tablespoons olive oil
- 3 bell peppers, sliced
- 1 large onion, sliced
- 3 cloves garlic, minced
- 1 can (14.5 oz) diced tomatoes with green chilies, undrained
- 2 tablespoons lime juice
- 1 tablespoon Worcestershire sauce
Tex-Mex Seasoning
- 2 teaspoons chili powder
- 2 teaspoons ground cumin
- 1 teaspoon smoked paprika
- 1 teaspoon onion powder
- 1 teaspoon garlic powder
- ½ teaspoon dried oregano
- ½ teaspoon black pepper
- 1 teaspoon salt
For Serving
- 8 flour tortillas, warmed
- Fresh cilantro, chopped
- Sour cream
- Guacamole
- Shredded cheese
- Salsa
Instructions
Prepare the Vegetables
Place the sliced onions and bell peppers in the bottom of the slow cooker. Spread them into an even layer so they can cook underneath the steak and absorb all the flavorful juices.
Season the Steak
In a small bowl, combine the chili powder, cumin, smoked paprika, onion powder, garlic powder, oregano, salt, and black pepper.
Pat the steak dry with paper towels, then rub the seasoning mixture evenly over both sides of the steak.
Add Everything to the Slow Cooker
Place the seasoned steak on top of the sliced peppers and onions.
Add the minced garlic, diced tomatoes with green chilies, lime juice, Worcestershire sauce, and olive oil. Pour the mixture over and around the steak so the flavors can blend as everything cooks.
Slow Cook
Cover the slow cooker and cook on LOW for 6–8 hours or HIGH for 3–4 hours, until the steak is very tender.
For the most tender results, cooking on LOW is recommended.
Slice the Steak
Carefully remove the cooked steak from the slow cooker and let it rest for a few minutes.
Slice the steak thinly against the grain. Cutting against the grain shortens the muscle fibers and helps make every bite more tender.
Return the sliced steak to the slow cooker and stir it together with the peppers, onions, and flavorful cooking juices.
Warm the Tortillas
Warm the flour tortillas in a dry skillet, microwave, or oven until soft and flexible.
Assemble the Fajitas
Fill each warm tortilla with a generous portion of the tender steak, peppers, and onions.
Top with fresh cilantro, sour cream, guacamole, shredded cheese, and salsa according to your preference.
Serve immediately with rice, beans, or tortilla chips on the side.
Tips for the Best Slow Cooker Steak Fajitas
Slice the vegetables into fairly thick pieces so they retain some texture during the long cooking process.
Flank steak and skirt steak both work well, but slicing the finished meat against the grain is especially important for tenderness.
For stronger lime flavor, add a little fresh lime juice just before serving rather than relying only on the lime juice added during cooking.
If you prefer spicier fajitas, add sliced jalapeños, extra chili powder, cayenne pepper, or a few dashes of hot sauce.
For a lower-carb option, serve the steak and vegetables over cauliflower rice or in lettuce wraps instead of flour tortillas.
Serving Suggestions
Serve these flavorful steak fajitas with Mexican rice, black beans, refried beans, tortilla chips, fresh guacamole, salsa, or a simple corn salad.
For a complete fajita bar, place the warm steak and vegetables in the center of the table and arrange the tortillas, cheese, sour cream, guacamole, salsa, and cilantro around them so everyone can build their own fajitas.
Prep Time: 15 minutes
Cooking Time: 6–8 hours
Total Time: 6 hours 15 minutes
Servings: 6
Calories: Approximately 465 kcal per serving