Preheat oven to 350 degrees and lightly grease a 9X13-inch baking pan.
In a medium bowl, whisk together eggs, milk, salt, pepper, and onion powder.
Slice sausage into 1/2-inch slices. Add to egg mixture.
Stir 1/2 of cheese into egg mixture.
Pour egg mixture into baking pan.
Spread tater tots evenly on top.
Season lightly with salt and pepper.
Place in oven and bake for 40 to 50 minutes.
Sprinkle remaining cheese on top. Place back in oven for 5 minutes.
Notes
Tater tots come in all different sized bags. Don't worry about that. You just need to add enough tater tots to cover the top well.If using pre-cooked sausage, you do not need to cook it before adding it to the casserole.You can substitute any kind of uncooked sausage for this recipe but you will need to cook it first.If you want to make this casserole spicy, add a pinch or two of crushed red pepper flakes to the egg mixture.