Cheesy Instant Mashed Potatoes with Fresh Chives
instant mashed potatoes transformed into a creamy, cheesy casserole with sharp cheddar and fresh chives. This side dish combines convenience with comfort, delivering restaurant-quality results in under an hour. Perfect for weeknight dinners alongside roasted chicken or beef, or as a potluck contribution. The baking step creates a golden, slightly crispy top while keeping the interior luxuriously creamy.
Ingredients
- 1 ⅓ cups water
- 2 tablespoons butter
- ¾ teaspoon onion salt
- ¼ teaspoon pepper
- 8 ounces sour cream
- 1 ⅓ cups mashed potato flakescauliflower rice mixed with flakes1:0.75reduces carbs
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- 8 ounces sharp cheddar cheese, shredded
- 1 tablespoon fresh chives, minced
Instructions
- 1
Preheat oven to 375 degrees F.
- 2
Bring water, butter, and onion salt to boil in a medium saucepan.
- 3
Remove from heat and stir in sour cream.
- 4
Add mashed potato flakes and stir gently until soft and moist.
- 5
Beat briskly with fork, reserving 2 tablespoons of cheese for garnish.
- 6
Stir in remaining cheese and chives.
- 7
Pour into a 1 quart casserole.
- 8
Garnish with reserved cheese.
- 9
Bake until top is lightly browned.
Tips
Reserve cheese before stirring to ensure even distribution and prevent clumping from residual heat.
Don't overmix the potato flakes; gentle stirring prevents gluey texture.
For extra creaminess, use full-fat sour cream and real block cheddar shredded fresh.
Good to Know
Cover and refrigerate up to 3 days. Reheat covered at 350F for 15-20 minutes.
Assemble completely through garnish step, cover, refrigerate overnight. Add 5-10 minutes to bake time from cold.
Serve hot as a side dish with roasted or grilled proteins. Pairs well with beef, chicken, or ham.
Common Mistakes
Overmix potato flakes to avoid starchy, gluey texture
Stir sour cream while off heat to avoid breaking or curdling
Don't skip the fork beating to avoid lumps in finished dish
Substitutions
Dairy-Free Swaps
General Alternatives
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FAQ
Can I make this ahead?
Yes, assemble fully through cheese garnish, cover with foil, refrigerate overnight. Bake from cold for 35-40 minutes until heated through and top browns.
Can I freeze leftovers?
Freeze unbaked casserole up to 1 month. Thaw overnight in refrigerator, then bake as directed, adding 10-15 minutes to cooking time.
What if I don't have sharp cheddar?
Use any aged or flavorful cheddar, or substitute gruyere, gouda, or fontina. Avoid mild cheddars which lose character when baked.