Vegetable cooking spray
1 medium white onion, peeled, diced
1 lb ground beef or meatless crumbles
1 bag frozen tater tots
1 can cream of celery or mushroom soup
8 oz. pkg. grated cheese

Spray large nonstick skillet with vegetable cooking spray. On medium high heat, saute onion until golden, about 3-4 minutes. Add lground beef and saute, stirring occasionally, until browned. Spray bottom of glass casserole dish with vegetable cooking spray. Place tater tots in bottom of dish. Spread soup over potatoes; layer hamburger/onion mixture on top.
Bake at 400: for 20 minutes. Remove from oven and sprinkle grated cheese on top. Return to oven and continue baking until cheese is melted and golden.
Note: I have made this many times and actually prefer to put the hamburger mix on the bottom and tater tots on top.

(2)