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Export 6 ingredients for grocery delivery
Preheat oven to 350˚F. Lightly grease a 9"x 13" baking dish and set aside.
Melt salted butter in a large skillet over medium-low heat. Add onions and cook, stirring occasionally for 25 to 30 minutes or until cooked down and evenly browned. Remove from heat and set aside.
In a large bowl combine condensed soup, sour cream and butter.
Add frozen potatoes and stir together until completely combined, then fold in 1 1/2 cups shredded cheese and caramelized onions.
Pour mixture into prepared baking dish and top with remaining 1/2 cup cheese and potato chips.
Bake casserole for 40 to 45 minutes or until golden brown and bubbling. Cool for 10 minutes and serve.