This easy Slow Cooker Sirloin Fajitas With Peppers and Onions recipe makes a flavorful, fuss-free meal. Tender sirloin, bell peppers, and onions cook slowly in a spiced lime marinade, creating juicy, restaurant-style fajitas. Serve in warm tortillas with your favorite toppings like guacamole, cheese, and salsa for a simple and delicious dinner!

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Recipe Ingredients

900 g / 2 lbs boneless sirloin, cut into thin strips
2 tbsp (30 ml) oil
2 tbsp (30 ml) lime juice
2 cloves garlic, minced
1 tsp ground cumin
2 tsp (10 g) seasoning salt (such as Lawry’s)
1 tsp chili powder
1 green bell pepper, thinly sliced
1 onion, thinly sliced
8–12 flour tortillas, warmed

Toppings:

• Shredded cheese
• Salsa
• Guacamole
• Sour cream
• Shredded lettuce
• Chopped tomato
• Chopped onion

How To Make Slow Cooker Sirloin Fajitas With Peppers and Onions

1. Prepare the Meat: Stir the sirloin, oil, lime juice, garlic, cumin, seasoning salt, and chili powder in a 6-quart (6-L) slow cooker.
2. Cook the Meat: Cover and cook on high for 3 hours or low for 6 hours.
3. Add the Vegetables: If cooking on low, turn the slow cooker to high, add the green pepper and onion, cover, and cook for 1 more hour.
4. Assemble and Serve: Serve the fajitas in warmed tortillas with your choice of toppings. Enjoy!

Recipe Tips

• Slice the sirloin thinly: This helps the meat cook evenly and stay tender. If it’s too thick, it may become chewy.
• Don’t add peppers and onions too early: Adding them in the last hour keeps them slightly crisp. If added too soon, they will become too soft.
• Use fresh lime juice: Fresh lime juice gives a better flavor than bottled juice and helps tenderize the meat.
• Warm the tortillas properly: Heat them in a dry pan or wrap them in foil and warm them in the oven to keep them soft and pliable.
• Let the beef rest before serving: Let the cooked beef sit for 5 minutes before serving to keep it juicy and flavorful.

Recipe FAQs and Variations

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• Slow Cooker Simply Awesome Meatloaf
• Slow Cooker Simple Shredded Pork Carnitas
• Slow Cooker Simple Fish Curry