Step 1

Mix olive oil, lemon pepper, cumin, paprika, dried mustard, and garlic powder together in a small bowl. Brush each tilapia fillet with mixture using a pastry brush. Flip; brush the other side. Cover with aluminum foil and refrigerate for 1 hour.

Step 2

Preheat an outdoor grill for high heat and lightly oil the grate.

Step 3

Spray a large piece of foil with cooking spray and place on the grill. Transfer tilapia onto the foil.

Step 4

Cook fillets on the preheated grill until they're easily flaked with a fork, about 5 minutes per side. Serve.