Gather ingredients: tortillas, bell peppers, onions, fajita seasoning, oil, salt, pepper, lime, cilantro (optional)
Choose protein: chicken, steak, shrimp, or a mix
Slice protein into thin strips (or cut shrimp if using)
Slice bell peppers and onions into thin strips
Make fajita seasoning mix (or use store-bought): chili powder, cumin, paprika, garlic powder, onion powder, oregano, salt, pepper, optional cayenne
Marinate protein: toss with oil, fajita seasoning, and lime juice; rest 15–30 minutes
Heat a large skillet or griddle over high heat
Add a little oil, then cook protein until browned and cooked through
Remove protein and set aside
Add peppers and onions to the same pan; cook until crisp-tender and slightly charred
Return protein to the pan and toss to coat with juices and seasoning
Warm tortillas in a dry skillet or microwave
Assemble: add protein and peppers/onions to tortillas
Finish with lime juice and cilantro (optional)
Serve immediately