Twice Baked Mashed Potato Casserole

This Twice Baked Mashed Potato Casserole is the ultimate comfort food side dish made with creamy mashed potatoes, sour cream, cheddar cheese, crispy bacon, and green onions. Baked until hot and bubbly with a golden cheesy topping, it’s an easy make-ahead casserole that’s perfect for holiday dinners, Sunday suppers, and family gatherings.

this recipe!

Try my slow cooker green bean casserole and Ruth’s Chris sweet potato casserole next!

Why You’ll Love This Potato Casserole

• Loaded with flavor: Creamy mashed potatoes, sharp cheddar, crispy bacon, and green onions make every bite rich and delicious.
• Perfect for holidays: This make-ahead potato casserole is an easy side dish for Thanksgiving, Christmas, Easter, or Sunday dinner. Great for feeding a crowd: It serves 6 to 8 people and pairs well with everything from roast chicken to ham and meatloaf.
• Easy to make ahead: Prepare it in advance, refrigerate, and bake when you’re ready to serve.

Ingredients You’ll Need

• 3-pound bag russet potatoes, peeled and cubed
• ¾ cup sour cream
• ½ cup heavy cream 
• ½ stick salted butter, softened
• 2 cups cheddar cheese, shredded and divided
• 6 slices bacon, cooked and crumbled
• ½ cup green onions, sliced
• 1 teaspoon salt
• ½ teaspoon ground black pepper

Step By Step Intructions

STEP ONE – Add 4 quarts of water to a large stock pot and bring to a boil. Add potatoes and cook until tender, then drain and add to a large mixing bowl.

STEP TWO – Preheat oven to 375 degrees F. Grease a 9×13 baking dish.

STEP THREE – Mash potatoes, then add sour cream, heavy whipping cream, butter, salt, and pepper, and continue mashing until combined.

STEP FOUR – Mix in half of the cheese, half the bacon, and half the green onion slices into the mashed potatoes.

STEP FIVE – Spread mashed potatoes in an even layer in the 9×13 baking dish.

STEP SIX – Top with remaining cheese and bacon.

STEP SEVEN – Bake uncovered for 26-28 minutes, or until just beginning to brown.

STEP EIGHT – Top with remaining green onions, then serve.

Storage Instructions

Store leftover Twice Baked Mashed Potato Casserole covered or in an airtight container in the refrigerator for up to 4 days. Reheat individual portions in the microwave until heated through, or cover the casserole with foil and reheat in a 350°F oven until warm.