01 -
Heat a large non-stick skillet over medium-high heat. Add the ground beef and diced onions, breaking up the beef with a wooden spoon until fully browned and onions are softened. Drain excess grease carefully.
02 -
Stir in the frozen corn kernels to allow slight thawing in the warm mixture. Pour in water, sprinkle brown gravy mix, salt, and black pepper evenly, then stir thoroughly to combine.
03 -
Bring the mixture to a boil, then reduce heat to a simmer. Cook until the gravy thickens and most liquid is absorbed, about 5 to 7 minutes. Meanwhile, prepare instant mashed potatoes according to package instructions.
04 -
Remove skillet from heat and immediately stir in shredded cheese until fully melted and integrated.
05 -
Arrange buns cut side up on a baking sheet. Toast in a preheated oven at 400°F for approximately 4 minutes until golden and crisp.
06 -
Spoon a generous layer of creamy mashed potatoes onto the bottom half of each toasted bun. Top with the cheesy beef mixture, then cover with the top bun. Serve immediately.