Slice steak thinly against the grain
Season with salt, pepper, chili powder, cumin, garlic powder, and paprika
Marinate with lime juice and oil for 30 minutes to 4 hours
Slice bell peppers and onions
Heat a skillet or grill pan over high heat
Add oil to the pan
Cook steak in a single layer for 2 to 4 minutes per side
Remove steak and let it rest
Cook peppers and onions until tender and slightly charred
Return steak to the pan and toss with vegetables
Warm tortillas
Serve with tortillas and desired toppings