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Originally shared on the web 04/04/2013

2 T. butter
3 Vidalia or other sweet onions, thinly sliced
8 oz. pkg. cream cheese, softened
8 oz. pkg. Swiss Cheese, shredded
1 c. grated Parmesan Cheese
1 c. mayonnaise
sweet potato chips

Melt butter in a large skillet over medium heat; add sliced onions. Cook, stirring often, 30 to 40 minutes or until onions are caramel colored. Combine onions, cheeses and mayonnaise, stirring well. Spoon dip into a lightly greased 1-1/2 to 2 quart casserole dish. Bake, uncovered, at 375 degrees for 30 minutes or until golden and bubbly. Serve with sweet potato chips. Makes 4 cups.