Butternut Squash Gratin – Creamy, Cheesy, and Perfect for Fall

Butternut Squash Gratin is the ultimate comfort side dish for fall and winter. Sweet, tender butternut squash slices are layered with a creamy cheese sauce and finished with a golden, crispy topping. This dish is rich in flavor but surprisingly easy to prepare, making it perfect for holiday dinners, weeknight meals, or any cozy gathering.

The combination of nutty squash, melted cheese, and fragrant herbs creates a luscious, savory-sweet side that pairs beautifully with roasted meats, poultry, or even as a hearty vegetarian main.

Why You’ll Love This Recipe

• Comforting and creamy: Rich cheese sauce and tender squash make every bite irresistible.
• Perfect for gatherings: A show-stopping side dish for holidays and dinner parties.
• Simple prep: Minimal ingredients with maximum flavor.
• Vegetarian-friendly: No meat required, yet filling and satisfying.
• Make-ahead option: Can be prepped in advance and baked when ready to serve.

Ingredients

• 2 lbs (900g) butternut squash, peeled and thinly sliced
• 2 tbsp unsalted butter
• 2 cloves garlic, minced
• 1 cup heavy cream
• 1/2 cup milk
• 1 tsp salt
• 1/4 tsp black pepper
• 1/4 tsp nutmeg (optional)
• 1 cup grated Gruyère cheese (or cheddar)
• 1/2 cup grated Parmesan cheese
• 1/2 cup breadcrumbs (panko or regular)
• 1 tsp fresh thyme leaves (optional)
• 1 tbsp olive oil (for topping)

Instructions

1. Preheat oven: Preheat oven to 375°F (190°C) and lightly butter a 9×13-inch baking dish.
2. Prepare squash: Peel and thinly slice the butternut squash into 1/4-inch slices. Set aside.
3. Make cream sauce: In a small saucepan over medium heat, melt butter. Add garlic and sauté 30 seconds until fragrant. Pour in heavy cream and milk, add salt, pepper, and nutmeg, and heat until warm. Remove from heat.
4. Layer the gratin: Arrange a layer of squash slices in the baking dish. Pour a small amount of the cream mixture over the squash, then sprinkle with Gruyère and a little Parmesan. Repeat layers until all squash and cream are used, finishing with cheese on top.
5. Add topping: Mix breadcrumbs with olive oil and sprinkle evenly over the top along with any remaining Parmesan.
6. Bake: Cover with foil and bake for 25 minutes. Remove foil and bake an additional 20–25 minutes until the top is golden brown and the squash is tender.
7. Garnish and serve: Let rest 5 minutes before serving. Sprinkle with fresh thyme leaves if desired.

Butternut Squash Gratin

Layers of tender butternut squash baked in a creamy cheese sauce with a golden breadcrumb topping for a perfect fall side dish.

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 45 minutes mins

Total Time 1 hour hr

Servings: 6 servings

Course: Side Dish

Cuisine: American, French-Inspired

Calories: 320

Ingredients Equipment Method Notes

Ingredients

  

Squash and Sauce

• 2 lbs butternut squash peeled and thinly sliced
• 2 tbsp unsalted butter
• 2 cloves garlic minced
• 1 cup heavy cream
• 0.5 cup milk
• 1 tsp salt
• 0.25 tsp black pepper
• 0.25 tsp nutmeg optional
• 1 cup Gruyère cheese grated
• 0.5 cup Parmesan cheese grated
• 0.5 cup breadcrumbs
• 1 tsp fresh thyme leaves optional
• 1 tbsp olive oil for topping

Equipment

• Baking dish
• Saucepan
• Mixing bowl
• Mandoline or knife

Method

 

1. Preheat oven to 375°F (190°C) and lightly butter a 9×13-inch baking dish.
2. Peel and thinly slice the butternut squash.
3. Melt butter in a saucepan over medium heat, sauté garlic 30 seconds.
4. Add cream, milk, salt, pepper, and nutmeg. Heat until warm.
5. Layer squash slices in baking dish, pour cream mixture over each layer, and sprinkle with Gruyère and Parmesan.
6. Mix breadcrumbs with olive oil and sprinkle over top.
7. Cover with foil and bake 25 minutes. Remove foil and bake 20–25 minutes until golden and tender.
8. Let rest 5 minutes, garnish with thyme, and serve.

Notes

Assemble ahead of time and bake later. Broil 2–3 minutes for extra crispiness.

Tips & Tricks

• Uniform slices: Use a mandoline for evenly sliced squash to ensure consistent cooking.
• Cheese swap: Gruyère adds nuttiness, but sharp cheddar or fontina works well too.
• Make it ahead: Assemble up to a day in advance and refrigerate. Bake covered, adding 5–10 minutes to the cook time.
• Crispier top: For extra crunch, broil 2–3 minutes at the end, watching closely.

Variations

• Add aromatics: Sauté onions or shallots with the garlic for deeper flavor.
• Spicy twist: Sprinkle a pinch of cayenne or smoked paprika in the cream sauce.
• Nut topping: Mix crushed walnuts or pecans with breadcrumbs for a nutty crust.

Serving Suggestions

• Serve alongside roasted chicken, turkey, or pork for a festive meal.
• Great addition to a vegetarian holiday spread with other roasted vegetables.
• Pair with a crisp salad to balance richness.

Fun Fact

Butternut squash is part of the winter squash family, known for its sweet, nutty flavor and vibrant orange color. Baking it in a gratin style with cheese has roots in French cuisine, where “gratin” refers to a dish with a golden, crusted top, often made with breadcrumbs or cheese.

Nutrition (per serving)

• Calories: 320
• Carbohydrates: 25g
• Protein: 10g
• Fat: 22g
• Saturated Fat: 12g
• Cholesterol: 60mg
• Sodium: 450mg
• Fiber: 4g
• Sugar: 5g
• Vitamin A: 140%
• Vitamin C: 20%
• Calcium: 30%
• Iron: 8%