Preheat oven to 350 degrees.

In a large skillet over medium high heat, cook beef until nicely browned and no pink remains; drain fats well.

In a mixing bowl, combine cooked beef, crumbled bacon, cheddar cheese, soup, and sour cream; spread prepared mixture into a greased 8 x 8 baking dish. Top with tater tots, placing them in even rows over the filling, then gently spray tater tots with nonstick baking spray.

Bake, uncovered, on center rack for 40-45 minutes, or until filling is hot and bubbly, and tater tots are golden brown. Garnish with cheese, chopped bacon, and sliced scallions, if desired; serve at once.