Wash all produce under cool running water with a soft vegetable brush.
Start by mixing together the chili powder, paprika, onion powder, garlic powder, cumin, cayenne pepper, salt. Add in the lime juice and mix well to create a runny paste.
Place flank steak in a seal-able plastic bag and place the spice paste in the bag thoroughly coating the steak.
Cook the beef over a medium high heat on the grill until it reaches at least 145 degrees (for 8 to 10 minutes on each side).
Slice the onion, and bell pepper and coat with olive oil and pepper.
Cook the onion and pepper over medium heat on the grill (recommend using a grill basket) until the vegetables soften.
Assemble the beef and vegetables on 8 tortillas.
Serve with your favorite fajitas sides! Our lemon rice goes well with this recipe and can be made ahead.