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5.0 from 9 votes

Mashed Potato Casserole Recipe

Make this Mashed Potato Casserole ahead of time for a budget-friendly holiday side. It's loaded with bacon, cheese, sour cream, and onions!

Prep Time
20 mins
Cook Time
1 hr
Total Time
1 hr 20 mins
Servings: 15 servings (about 1 cup each)
Calories: 180 kcal
Course: Side Dish
Cuisine: American

Ingredients

  • 6 trips Bacon $1.74
  • 3 lbs russet potatoes* $1.95
  • water** $0.00
  • ½ tsp salt $0.01
  • 5 Tbsp salted butter (plus a little extra to butter your casserole dish) $1.25
  • ½ yellow onion, diced small $0.47
  • 3 cloves garlic, minced $0.09
  • ½ cup whole milk $0.14
  • ¼ cup sour cream $0.31
  • ½ tsp freshly cracked black pepper $0.05
  • ½ tsp smoked paprika $0.08
  • salt, to taste (I added about 1 tsp) $0.01
  • ¼ tsp chili flakes (optional) $0.06
  • ¼ cup shredded Parmesan $1.07
  • ½ cup shredded cheddar $0.56
  • 2 green onions (about 2 Tbsp), diced $0.15

Instructions

    Cup of Yum
  1. Preheat your oven to 400ºF. Cook bacon in the oven until crispy.
  2. Once cooked and crispy, drain your bacon on paper towels. Set aside for now.
  3. Peel potatoes and dice them into 1–2-inch cubes, rinse well.
  4. Put potatoes in large pot, covered by 2 inches of water. Add ½ tsp salt.
  5. Boil until fork-tender (on the softer side), about 15-20 minutes.
  6. Drain potatoes and rinse with warm water. Set aside. Rinse out potato pot briefly and give it a quick wipe.
  7. Melt salted butter in the potato pot and add onion. Cook until soft and glossy.
  8. Add minced garlic and cook for 2 minutes until fragrant.
  9. Add cooked potatoes back to pot with onions and garlic. Mash with potato masher until they are the consistency you prefer, being careful not to overmix to avoid a gummy texture.
  10. Add whole milk, sour cream, pepper, smoked paprika, salt (to taste), and chili flakes (optional) and combine.
  11. Butter a 9x13” casserole dish. Transfer potatoes to the buttered casserole dish and smooth out with a spatula.
  12. Top with shredded parmesan, shredded cheddar, and crumbled bacon.
  13. Bake in oven at 400ºF for 20 minutes covered with foil, then uncover for 10 minutes.
  14. Garnish with green onions and serve.

Notes

  • *Russet and Yukon Gold potatoes are both great choices for mashed potatoes, so use whichever you like best that fits your budget. Yukon Gold is typically more expensive, so I made this recipe with Russets.
  • **The amount of water needed will depend on the size of your pot. You need enough to cover the potatoes by about 2 inches.

Nutrition Information

Serving 1serving (about 1 cup) Calories 180kcal (9%) Carbohydrates 18g (6%) Protein 5g (10%) Fat 10g (15%) Sodium 382mg (16%) Fiber 1g (4%)

Nutrition Facts

Serving: 15servings (about 1 cup each)

Amount Per Serving

Calories 180

% Daily Value*

Serving 1serving (about 1 cup)
Calories 180kcal 9%
Carbohydrates 18g 6%
Protein 5g 10%
Fat 10g 15%
Sodium 382mg 16%
Fiber 1g 4%

* Percent Daily Values are based on a 2,000 calorie diet.