Cook and stir beef and onion in a skillet over medium-high heat until beef is browned and crumbly, about 5 minutes; drain and discard grease.
Reduce heat to low. Stir mushroom soup, corn, ketchup, and pepper into beef mixture; cook until heated through, about 2 minutes. Divide beef mixture into four 4-inch round baking pans; spread prepared mashed potatoes over beef mixture.
Bake in the preheated oven until potatoes are lightly browned, about 15 minutes.
Set oven rack about 6 inches from the heat source and preheat the oven’s broiler.
Sprinkle Cheddar cheese evenly over pies. Place pies on a baking sheet.
Broil until cheese is melted, about 2 minutes. Allow to cool for 5 minutes before serving.
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