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Potato Casserole with Caramelized Onions
Ingredients (10)
- 3/4 cup (1½ sticks) butter,
- 1/4 cup olive oil
- 6 large sweet onions,
- 1 tablespoon granulated white sugar
- 4 pounds baking potatoes,
- 4 cups chicken broth
- 1 cup whipping cream
- 1 cup sour cream
- 4 large eggs,
- 1/2 teaspoon salt