2 (10.75 ounce) cans condensed cream of mushroom soup, undiluted
1 1/3 cups sour cream
1 large onion, chopped
1 pound sliced bacon, cooked and crumbled
1 (32 ounce) package tater tots

In a large bowl, combine the soup, sour cream and onion. Add the bacon and Tater Tots; stir until combined.
Transfer to a greased 13-in. x 9-in. x 2-in. baking dish. Cover and bake at 350 degrees F for 50 minutes. Uncover and bake 8-10 minutes longer or until golden brown.