Preheat oven to 375°F (190°C). Grease a 9x13 inch baking dish.
In a large skillet, cook the ground beef, onion, and green bell pepper over medium heat until beef is browned and vegetables are tender. Drain excess fat.
Stir in the sloppy joe sauce and cook for 2 minutes until warmed through.
Transfer the beef mixture into the prepared baking dish. Sprinkle 1 cup of shredded cheese over the mixture.
Top with an even layer of frozen tater tots.
Bake uncovered for 30-35 minutes or until tater tots are golden brown and crispy.
Sprinkle the remaining cheese over the casserole and bake for an additional 5 minutes until melted.
Serve warm and enjoy!