Baked Cheddar Potato Casserole with Green Onion Topping

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

Creamy mashed potatoes baked with sharp cheddar and fresh green onions for a simple, crowd-pleasing side dish. This american-inspired vegetarian ready in about 40 minutes pairs butter, milk, shredded cheddar cheese for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 280 calories and feeds 6, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 20 min Cook: 20 min Serves 6 American cuisine 280 cal/serving
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Ingredients

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Instructions

  1. Step 1: Preheat oven to 375°F.
  2. Step 2: Place 4 large peeled and diced potatoes (1/2-inch cubes) in a pot, cover with cold water, and bring to a boil. Cook for 15 minutes until fork-tender.
  3. Step 3: Drain potatoes and return to pot. Add 2 tbsp butter, 1/4 cup milk, 1/2 tsp salt, and 1/4 tsp black pepper. Mash until smooth and creamy.
  4. Step 4: Stir in 1 cup shredded cheddar cheese until melted and fully incorporated.
  5. Step 5: Transfer to a greased baking dish and sprinkle 1/4 cup thinly sliced green onions over the top.
  6. Step 6: Bake for 20 minutes until golden and bubbly around the edges.

Frequently asked questions

How long does Baked Cheddar Potato Casserole with Green Onion Topping take to make?

Total time is about 40 minutes (20 min prep + 20 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Baked Cheddar Potato Casserole with Green Onion Topping?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep butter from drying out.

Can I substitute ingredients in Baked Cheddar Potato Casserole with Green Onion Topping?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Baked Cheddar Potato Casserole with Green Onion Topping for a different number of people?

The recipe is written for 6 servings. Multiply each ingredient by (your serving target / 6). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

What goes well with Baked Cheddar Potato Casserole with Green Onion Topping?

American vegetarian like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.

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