Marinate the beef: In a bowl, combine the beef strips with lime juice, minced garlic, cumin, chili powder, paprika, salt, and pepper. Mix well and let it marinate for at least 15 minutes.

Heat the pan: Heat 1 tbsp of olive oil in a large skillet or cast-iron pan over medium-high heat.

Cook the beef: Add the marinated beef to the hot pan and cook for 3-4 minutes, stirring occasionally, until browned. Remove the beef from the pan and set aside.

Cook the vegetables: In the same pan, add the remaining olive oil. Add the sliced bell peppers and onions. Cook for 5-6 minutes until they are tender and slightly charred.

Combine and finish: Return the beef to the pan with the vegetables. Stir well and cook for another 1-2 minutes to combine the flavors.

Warm the tortillas: Heat the tortillas in a dry skillet or microwave for about 30 seconds until warm and pliable.

Serve: Serve the beef and vegetable mixture on warm tortillas. Garnish with fresh cilantro and lime wedges if desired.