Marinate the Steak: In a bowl, toss steak strips with 1 tablespoon olive oil, chili powder, cumin, paprika, garlic powder, salt, pepper, and lime juice. Let it marinate while you prep the veggies.
Cook the Veggies: Heat the remaining olive oil in a large skillet over medium-high heat. Add bell peppers and onion. Sauté for 4-5 minutes until just tender and a little charred. Remove from skillet and set aside.
Cook the Steak: In the same skillet, add steak in a single layer. Sear for 2-3 minutes per side until browned and cooked to your liking.
Combine: Return veggies to the skillet with the steak. Toss everything together for 1-2 minutes so the flavors mingle.
Serve: Spoon the steak and veggies into warm tortillas. Pile on your favorite toppings and dig in!