Brown the ground beef and onion. Sprinkle the Oxo into the mixture. Add ketchup and BBQ sauce. Add salt and pepper. Stir to combine all ingredients. While this is browning, prepare both packages of the Butter and Herbs Instant Mashed potatoes - according to box instructions.
Preheat the oven to Broil. Spread the meat mixture into a lasagna pan. Add the peas/carrots. Spread the instant mashed potatoes over the entire mixture. Spread the grated cheese on top of the mixture.
Place under the broiler until cheese melts - about 5 minutes.