Flank Steak Fajitas with Grilled Peppers and Onions

By AislePrompt Editorial · Published 2026-05-17 · Updated 2026-05-17

Juicy marinated flank steak grilled with bell peppers and onions, served as sizzling fajitas perfect for a casual dinner. This Mexican-inspired beef recipe, ready in about 60 minutes, pairs flank steak, red bell pepper, green bell pepper for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 360 calories and feeds 4, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Ingredients

• 1 lb flank steak
• 1 large, sliced into strips red bell pepper
• 1 large, sliced into strips green bell pepper
• 1 medium, sliced into strips yellow onion
• 3 tbsp olive oil
• 2 tbsp lime juice
• 1 tsp ground cumin
• 1 tsp chili powder
• 1/2 tsp garlic powder
• 1 tsp salt
• 1/2 tsp black pepper
• 8 small corn tortillas

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Instructions

1. Step 1: In a bowl, whisk together 3 tbsp olive oil, 2 tbsp lime juice, 1 tsp ground cumin, 1 tsp chili powder, 1/2 tsp garlic powder, 1 tsp salt, and 1/2 tsp black pepper to create a marinade.
2. Step 2: Place 1 lb flank steak in a shallow dish and pour marinade over it, turning to coat evenly. Cover and refrigerate for at least 30 minutes to absorb flavors.
3. Step 3: Preheat grill or grill pan to medium-high heat. Remove steak from marinade and grill for 4-5 minutes per side for medium-rare, or longer to desired doneness. Rest steak for 10 minutes before slicing thinly against the grain.
4. Step 4: While steak rests, grill 1 large sliced red bell pepper, 1 large sliced green bell pepper, and 1 medium sliced yellow onion for 5-7 minutes until slightly charred and tender.
5. Step 5: Warm 8 small corn tortillas on the grill for 1 minute per side. Serve sliced steak with grilled peppers and onions wrapped in tortillas.