Preheat oven to 400°F and spray a loaf pan with nonstick spray.
Combine all ingredients thoroughly with hands in a large mixing bowl. Once fully combined, press hamburger mixture into the loaf pan so that the meatloaf is flat and even throughout the loaf pan.
Bake uncovered for 45 minutes, then spread additional steak sauce over top and bake an additional 15 minutes.
Let rest 5 minutes before slicing, then serve and enjoy!