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 package frozen stir-fry peppers
1 large onion, cut into slices
1 14.5-oz can Mexican-style tomatoes (undrained)
Nonstick cooking spray