Potato Casserole with Caramelized Onions

Ingredients

• ¼ cup olive oil
• 6 large sweet onions, diced
• 4 pounds baking potatoes, peeled and cubed
• 1 cup sour cream
• 4 large eggs, lightly beaten
• 4 cups chicken broth
• 1 cup whipping cream
• + 3 more ingredients
• • ½ teaspoon salt
  • ¾ cup butter, divided
  • 1 tablespoon sugar

Melt 1/4 cup butter in a large skillet over medium heat. Add olive oil, onions, and sugar. Cook, stirring often, 25 to 30 minutes or until onions are deep golden brown. Remove from heat, and set aside.Bring potatoes and chicken broth to a boil in a Dutch oven; cook 20 minutes or until tender. Dra...

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