Get a flavor burst of protein with this mouthwatering recipe.
1 lb flank steak, sliced in half lengthwise, then cut into 1⁄2-inch slices
1 packet taco seasoning
1 (16 oz) package frozen stir-fry peppers
1 Large onion, cut into slices
1 (14.5 oz) can Mexican-style tomatoes (do not drain)
Nonstick cooking spray