... it takes .717 kwh of electricity (about $0.08) to cook a frozen pizza. This includes the oven pre-heat time of roughly 5 minutes and the cook time of 15 minutes.
... it takes .293 kwh of electricity (about $0.03) to cook a box of Kraft Macaroni & Cheese.
... it takes .245 kwh of electricity (about $0.03) to cook a serving of spaghetti. One burner on the stove is cooking the noodles, the other is for the sauce.