Butternut Squash Stuffed Shells

20 jumbo shells
2 1/2 cups cubed butternut squash
1 teaspoon olive oil
1/4 teaspoon salt
1/4 teaspoon pepper
1/4 teaspoon nutmeg
2 tablespoons unsalted butter
1 shallot, chopped
1 garlic clove, minced
1 1/2 tablespoons mascarpone cheese
1 tablespoon grated parmesan cheese

Sauce
2 tablespoons butter
2 tablespoons flour
2 cups milk (I used 2%)
1/4 pinch of nutmeg
salt & pepper to taste

Topping
1/4 cup grated parmesan cheese
1/3 cup mozzarella cheese
10-15 sage leaves

Preheat oven to 400 degrees F. Place butternut squash on a baking sheet and toss with salt, pepper, nutmeg and olive oil. Roast for 20 minutes, flip, then roast for 20 minutes more. Remove from oven and mash with a fork or potato masher until almost pureed.

Prepare shells according to directions. Drain pasta and set aside to cool. While pasta is cooking, heat a small saucepan over medium heat and add 2 tablespoons butter, garlic and shallots. Whisk until brown bits appear in the butter, then mash into the butternut squash, along with the mascarpone and and tablespoon of parmesan. Spray a baking dish with nonstick spray. Spoon about 1 1/2-2 tablespoons of squash into each shell, then lay in the dish. Repeat.

To make the sauce, heat a saucepan over medium heat and add butter. Once sizzling, whisk in flour and cook until golden and a nutty aroma appears. Add milk and parmesan and let come to a simmer while whisking constantly. Once sauce has thickened, stir in nutmeg and taste – add salt and pepper if desired. Pour mixture over top of shells, then add mozzarella and sage. Bake at 400 degrees F for 20-25 minutes, or until cheese is golden and bubbly.