Slice beef, chicken, or shrimp into thin strips
Pat the meat dry
Season with salt, pepper, chili powder, cumin, garlic powder, and paprika
Add lime juice and a little oil
Marinate for 15 minutes to 2 hours
Heat a skillet or grill over medium-high heat
Add a little oil to the pan
Cook the meat in a single layer
Avoid overcrowding the pan
Stir or flip once or twice until browned and cooked through
Remove from heat immediately when done
Rest the meat for a few minutes
Slice against the grain if using beef
Serve with peppers, onions, and tortillas