Mashed Potato Casserole | America's Test Kitchen

Ingredients

• 4 pounds russet potatoes , peeled and cut into 1-inch chunks
• 1/2 cup half-and-half
• 1/2 cup low-sodium chicken broth
• 12 tablespoons unsalted butter (1 1/2 sticks), cut into pieces
• 1 garlic clove , minced
• 2 teaspoons Dijon mustard
• 2 teaspoons salt
• 4 large eggs
• 1/4 cup finely chopped fresh chives