sentence: preheat oven to 350 f degree sentence: chop one large onion into pieces sentence: cut some slices of white bread into cubes sentence: add the chopped onions to some meat loaf sentence: season with salt black pepper and garlic powder and mix them together sentence: add the cubed bread to the mixture sentence: pour some milk and one egg and mix them together sentence: add some yellow mustard and some ketchup sentence: mix the mixture and place into the pan sentence: add a little yellow mustard ketchup and brown sugar and stir to combine sentence: pour and spread the sauce sentence: bake the mixture in the oven