Heat olive oil in a pan over medium-high heat. Add sliced beef and cook for 3-5 minutes until browned.
Add garlic, bell peppers, and onions to the pan. Stir-fry for 3-4 minutes until vegetables are tender.
Season with chili powder, cumin, paprika, garlic powder, oregano, salt, and pepper. Add lime juice and stir to combine.
Warm the tortillas in a dry skillet for 1 minute on each side. Serve beef and vegetables in tortillas with optional toppings of sour cream, guacamole, shredded cheese, and cilantro.
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Notes
Feel free to customize the toppings and seasoning to your liking. This recipe is versatile and can be adjusted for different tastes.