Preheat your oven to 375°F (190°C).
In a large skillet, brown the ground beef over medium-high heat.
Add the diced onion and cook until softened, about 5 minutes.
Stir in the Sloppy Joe sauce, Worcestershire sauce, garlic powder, salt, and black pepper.
Spread the Sloppy Joe mixture evenly in a greased 9x13-inch baking dish.
Arrange the frozen Tater Tots in a single layer over the Sloppy Joe mixture.
Sprinkle the shredded cheddar cheese evenly over the Tater Tots.
Bake in the preheated oven for 30-35 minutes, or until Tater Tots are golden brown.
Let the casserole cool for a few minutes before serving.
Garnish with chopped parsley if desired.