Cooking Techniques
PanPotPlates
Cheesy Spinach and Potato Casserole with Parmesan Breadcrumb Topping
By PanPotPlates Test KitchenReviewed by PanPotPlates Editorial TeamPublished May 8, 2026 · Updated May 11, 2026
American-Inspired
65 mins
casserolesvegetarianfamily-friendlycomfortfoodeasyfreezableleftovers
A comforting, vegetarian casserole with tender potatoes and fresh spinach baked in a creamy, cheesy sauce topped with a crispy Parmesan breadcrumb crust. Easy to prepare, freezer-friendly, and ideal for family meals and leftovers.
Prep
20 min
Cook
45 min
Total
65 min
Servings
6
Difficulty
easy
Cuisine
American-Inspired
Ingredients
Servings
6
- 4 cups peeled and thinly sliced potatoes (Yukon Gold or Russet)
- 3 cups fresh spinach, roughly chopped
- 1/4 cup unsalted butter
- 3 cloves garlic, minced
- 1 small onion, finely diced
- 3 tablespoons all-purpose flour
- 2 cups whole milk
- 1 cup shredded sharp cheddar cheese
- 1/2 cup shredded mozzarella cheese
- 1/2 cup grated Parmesan cheese, divided
- 1/2 teaspoon salt
- 1/4 teaspoon black pepper
- 1/4 teaspoon ground nutmeg
- 1 cup breadcrumbs (preferably panko)
- Cooking spray or butter for greasing the casserole dish
Instructions
-
Preheat oven to 375°F (190°C). Lightly grease a 9x13-inch casserole dish with cooking spray or butter.
-
Bring a large pot of salted water to a boil. Add sliced potatoes and cook for 5 minutes until just tender but not falling apart. Drain and set aside.
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In a large skillet over medium heat, melt butter. Add diced onion and cook until translucent, 4-5 minutes.
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Add minced garlic and cook 1 minute until fragrant, stirring to prevent burning.
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Sprinkle flour over onion and garlic, stirring constantly to form a roux. Cook 2 minutes to eliminate raw flour taste.
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Gradually whisk in milk, stirring until sauce thickens and is smooth, about 4-5 minutes.
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Remove sauce from heat and stir in cheddar, mozzarella, 1/4 cup Parmesan, salt, pepper, and nutmeg until cheese melts.
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Fold in chopped spinach, allowing residual heat to gently wilt the greens.
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In the casserole dish, layer half the potatoes evenly. Pour half the cheese and spinach sauce over potatoes. Repeat layers, smoothing the top.
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Combine breadcrumbs with remaining 1/4 cup Parmesan and sprinkle evenly over casserole.
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Bake uncovered 35-40 minutes, until topping is golden and casserole is bubbly at edges.
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Let casserole cool 10 minutes before serving to set for easier slicing.
-
Store leftovers in an airtight container in the refrigerator for up to 3 days or freeze up to 3 months. Reheat covered in a 350°F (175°C) oven until warmed through.
Frequently Asked Questions
Reader questions and answers for this recipe will appear here.
Customize this Cheesy Spinach and Potato Casserole to meet dietary needs or ingredient availability with these substitutions:
- Potatoes: Substitute Yukon Gold or Russet with sweet potatoes for a naturally sweeter, nutritious option.
- Spinach: Swap fresh spinach with kale, Swiss chard, or frozen spinach (well-drained) to vary greens.
- Butter: Use olive oil or dairy-free margarine to make the dish dairy free.
- Milk: Replace whole milk with unsweetened almond, oat, or another plant-based milk for vegan and dairy-free adaptations, preserving creaminess.
- Cheeses: Use vegan cheese alternatives or nutritional yeast to create a vegan-friendly version with cheesy flavor.
- Flour: Swap all-purpose flour for gluten-free flour blends or cornstarch to suit gluten-free diets.
- Breadcrumbs: Use gluten-free panko or crushed gluten-free crackers for a crispy, allergen-friendly topping.
These simple ingredient swaps keep the casserole flavorful, family-friendly, and adaptable without sacrificing texture or comfort, supporting vegetarian, vegan, dairy-free, or gluten-free needs.
Pan Or Pot Required
For this hearty and comforting Cheesy Spinach and Potato Casserole, you'll need cookware suited for its stepwise preparation and baking, fitting perfectly into our Casseroles category.
Essential cookware:
- Large pot: To parboil thinly sliced potatoes until just tender. Use a pot big enough to hold potatoes in a single layer for consistent cooking. This step prevents mushy potatoes in the final dish.
- Large skillet (preferably nonstick or heavy-bottomed): For making the creamy cheese sauce—melting butter, sautéing onions and garlic, preparing the roux, and whisking in milk. A wide skillet ensures even cooking and smooth sauce texture.
- 9x13-inch casserole dish (baking dish): Oven-safe vessel where potato layers, spinach-cheese sauce, and Parmesan breadcrumb topping are assembled and baked. Provides even heat distribution for a golden crust and bubbly interior.
This cookware lineup optimizes prep and cleanup efficiency while guaranteeing a tender, flavorful casserole with a visually appealing crispy topping. The use of a pot and skillet before baking embodies classic casserole techniques—ideal for wholesome, family-friendly comfort food designed for easy leftovers and meal prep.
Cookware Size Guidance
Use a standard 9x13-inch (approximately 3-quart) casserole dish for this Cheesy Spinach and Potato Casserole. This size provides ample space to layer potatoes and sauce evenly, ensuring thorough cooking and a perfectly crisp breadcrumb topping.
If unavailable, select an oven-safe baking dish between 3 to 4 quarts in capacity. Avoid dishes too small or too large, as this can affect layer thickness, cooking time, and moisture balance.
Recommended materials include glass, ceramic, or metal baking dishes lightly greased to prevent sticking and aid browning. Ensure the dish withstands oven temperatures of at least 375°F (190°C) for safe, reliable baking. Choosing the right size and material improves your cooking outcome and ensures a satisfying, family-friendly meal.
Cookware Swap Guidance
While a 9x13-inch casserole dish is ideal for this Cheesy Spinach and Potato Casserole with Parmesan Breadcrumb Topping, you can adapt using these PanPotPlates-approved cookware options:
- Deep Baking Dish or Ovenproof Pan: Any glass, ceramic, or metal dish with 2–3 quart capacity works well if oven-safe to 375°F (190°C). Expect small adjustments in cooking time due to size differences.
- Oven-Safe Cast Iron Skillet: A 10–12 inch skillet offers excellent heat retention and a flavorful crust. Perfect for a rustic, skillet-style casserole that stays true to family-friendly comfort food themes.
- Oven-Safe Dutch Oven or Enamel Pot: Ideal for one-pot cooking, these heavy-duty vessels distribute heat evenly, allowing you to prepare and bake in the same cookware, enhancing convenience without sacrificing quality.
Tips: Grease your chosen pan thoroughly and monitor baking time, especially if your dish varies in size or thickness. Smaller or deeper pans may need slightly longer baking for thorough cooking and crispy topping.
These flexible options keep your casserole accessible, maintain ease of preparation, and preserve its comforting, family-friendly appeal—perfect for one-pan meal preps and satisfying leftovers.
Leftovers Quality
This cheesy spinach and potato casserole makes excellent leftovers, ideal for meal prep and budget-conscious family meals. After baking, cool the casserole to room temperature before storing.
Refrigeration: Store in airtight containers and refrigerate up to 3 days to maintain the creamy cheese sauce and crispy topping texture.
Freezing: Freeze leftovers up to 3 months in well-wrapped containers or freezer-safe bags to protect from freezer burn. Thaw overnight in the refrigerator before reheating.
Reheating: Reheat covered in a 350°F (175°C) oven for 20–25 minutes until warmed through to preserve the creamy interior and crispy breadcrumb topping. Avoid microwave reheating to prevent sogginess and uneven heating.
Following these storage and reheating tips keeps your one-pot comfort casserole delicious, whether enjoyed fresh or as flavorful leftovers.
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