Ingredients for - Mama's Famous Cheesy Mashed Potato Casserole

1. Potatoes, peeled and cubed 5 pounds
2. Sour cream 1 cup
3. Butter ½ cup
4. Grated Parmesan cheese ½ cup
5. Cream cheese, softened 6 ounces
6. Extra-sharp Cheddar cheese, shredded 4 ounces
7. Green onions, chopped 4 stalks
8. Salt 1 teaspoon
9. Ground black pepper 1 teaspoon

How to cook deliciously - Mama's Famous Cheesy Mashed Potato Casserole

1 . Stage

Place potatoes into a large pot and cover with salted water; bring to a boil. Reduce heat to medium-low and simmer until tender, 15 to 20 minutes.

2 . Stage

While the potatoes are cooking, preheat the oven to 350 degrees F (175 degrees C).

3 . Stage

Drain potatoes and return to the pot. Mash while hot. Add sour cream, butter, Parmesan cheese, cream cheese, Cheddar cheese, green onions, salt, and pepper; beat until well blended. Transfer to a 3-quart casserole.

4 . Stage

Bake in the preheated oven for 45 minutes. Serve piping hot.