01 -
Set the oven to 400°F and allow it to fully preheat.
02 -
In a large mixing bowl, blend the condensed cream of mushroom soup and whole milk until smooth.
03 -
Whisk in salt, ground black pepper, garlic powder, and onion powder until evenly incorporated.
04 -
Stir in the drained canned green beans and French's fried onions, ensuring all components are well coated.
05 -
Transfer the green bean mixture to a greased 9 x 13 inch baking dish, spreading evenly.
06 -
Evenly distribute the shredded mozzarella and cheddar cheese blend over the green bean mixture.
07 -
Arrange the frozen tater tots in a single, even layer across the top.
08 -
Place the dish in the preheated oven and bake for 35 to 40 minutes, or until the tater tots are golden-brown and the casserole is thoroughly heated.
09 -
Remove from the oven and allow to rest for several minutes before serving.