01 -
Preheat the oven to 375°F. Spray a 9x13-inch baking dish with non-stick cooking spray.
02 -
In a large skillet over medium heat, cook the ground beef and diced onion until the beef is fully browned. Drain any excess grease.
03 -
Stir in the BBQ sauce and season with salt and pepper. Let it simmer for 2-3 minutes.
04 -
Spread the BBQ beef mixture evenly into the bottom of the prepared baking dish. Sprinkle half the cheddar and mozzarella cheeses over the beef layer.
05 -
Arrange the frozen tater tots in a single layer on top.
06 -
Bake uncovered for 35-40 minutes, or until the tater tots are golden and crispy.
07 -
Remove the casserole from the oven. Sprinkle the remaining cheese and the crumbled turkey bacon on top.
08 -
Return to the oven for another 5-7 minutes, until the cheese is melted.
09 -
Let the casserole cool slightly, then top with dollops of sour cream and sprinkle with green onions before serving.