Cheesy Spinach and Potato Casserole

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

A creamy comfort dish with layers of tender potatoes, sautéed spinach, and melted cheese. This american-inspired quick meals (vegetarian) ready in about 60 minutes pairs potatoes, frozen spinach, grated cheddar cheese for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 320 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: 30 min Cook: 30 min Serves 6 American cuisine 320 cal/serving
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Ingredients

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Instructions

  1. Step 1: Preheat oven to 375°F (190°C). In a large pot, boil 2 lbs peeled and cubed potatoes for 10-12 minutes until tender. Drain and set aside.
  2. Step 2: In a skillet, melt 2 tbsp butter over medium heat. Add 1/2 cup chopped onion and sauté for 3-4 minutes until translucent. Stir in 10 oz thawed and squeezed dry spinach. Cook for 5 minutes until wilted. Season with 1/2 tsp salt and 1/4 tsp black pepper.
  3. Step 3: In a large bowl, combine cooked potatoes, spinach mixture, and 1/2 cup milk. Mix until well combined.
  4. Step 4: Transfer mixture to a greased 9x13-inch baking dish. Top evenly with 1 cup grated cheddar cheese.
  5. Step 5: Bake for 25-30 minutes until the cheese is golden and bubbly. Let cool slightly before serving.

Frequently asked questions

How long does Cheesy Spinach and Potato Casserole take to make?

Total time is about 60 minutes (30 min prep + 30 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 Cheesy Spinach and Potato Casserole?

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 potatoes from drying out.

Can I substitute ingredients in Cheesy Spinach and Potato Casserole?

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 Cheesy Spinach and Potato Casserole 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.

Is Cheesy Spinach and Potato Casserole vegetarian?

Yes — this recipe is tagged vegetarian based on its ingredient list. Always cross-check labels for packaged ingredients (sauces, broths, condiments) since formulations vary by brand.

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