My DH was feeling nostalgic for foods of his youth. After an online search (and some tinkering) we came up with this winner! Ore-Ida Crispy Crowns work better than plain old Tots if you like this crispy.
Preheat oven to 375°F Brown ground beef with onions until cooked. Drained thoroughly, then put in bottom of a 2 qt casserole dish. Mix mushroom soup and milk. Pour over ground beef. Sprinkle 2-3 cups of frozen mixed veggies over ground beef/mushroom soup. Top with 1/2 cup cheese, Crispy Crowns and the remaining cheese. Bake (uncovered) for 45-50 minutes or until crowns are crunchy.