Preheat oven to 375°F and lightly grease a baking dish.
In a large skillet over medium heat, cook ground beef until browned. Drain excess grease if needed.
Add onion and bell pepper and cook until softened, about 4–5 minutes. Stir in garlic and cook for 1 minute.
Stir in sloppy joe sauce, ketchup, Worcestershire sauce, salt, and pepper. Simmer for 5 minutes until thickened.
Transfer sloppy joe mixture to the prepared baking dish.
Sprinkle shredded cheddar cheese evenly over the filling.
Arrange frozen tater tots in a single layer on top.
Bake for 30–35 minutes until tater tots are crispy and golden brown.
Allow casserole to cool slightly before serving. Garnish with parsley if desired.