Craving a rich fall pasta recipe? Try butternut squash stuffed shells with creamy filling and tender pasta!! Here’s your next favorite dinner, one forkful at a time!!

Butternut squash stuffed shells emerge from the oven bubbling around golden cheese, with sweet roasted squash and lemony ricotta tucked into every tender pasta pocket!

Bring this pan to dinner with a crisp green salad, grab a serving spoon, and give yourself first dibs on a browned corner. Those corners deserve a reservation!

Ingredients

For Roasting and Filling

• 1¾ pounds (800 g) peeled, seeded butternut squash, cut into ¾-inch cubes; buy a whole squash weighing approximately 2½ to 3 pounds
• 2 tablespoons olive oil
• ¾ teaspoon fine sea salt, divided, plus more to taste
• ¼ teaspoon freshly ground black pepper
• 1 container (15 ounces / 425 g) whole-milk ricotta, drained if watery
• ½ cup (50 g) finely grated Parmesan
• 1 large egg
• 1 teaspoon finely grated lemon zest, using only yellow peel
• ⅛ teaspoon ground nutmeg

For Pasta and Cheese Topping

• 28 jumbo pasta shells, to allow for a few torn shells; you will fill 24
• Salt for pasta water, about 1 tablespoon fine salt for 4 quarts water
• 1 teaspoon olive oil, plus a little for greasing your baking dish
• 1 cup (4 ounces / 115 g) shredded low-moisture mozzarella
• ¼ cup (25 g) finely grated Parmesan

For Brown Butter Sage Sauce

• 4 tablespoons (56 g) unsalted butter
• 1 tablespoon finely chopped fresh sage
• 3 medium garlic cloves, finely minced
• 3 tablespoons (24 g) all-purpose flour
• 2½ cups (600 ml) whole milk, plus a few tablespoons if needed to thin sauce
• ½ cup (120 ml) low-sodium vegetable broth
• ½ teaspoon fine sea salt, then adjust to taste
• ¼ teaspoon freshly ground black pepper
• 1 teaspoon fresh lemon juice

For Toasted Pepita Breadcrumbs

• ⅓ cup (20 g) panko breadcrumbs
• 2 tablespoons (18 g) raw, unsalted pepitas, roughly chopped; these are shelled pumpkin seeds
• 2 teaspoons olive oil
• Small pinch of fine sea salt

Servings: 6, with 4 stuffed shells per serving
Yield: 24 filled jumbo shells

How to Make Butternut Squash Stuffed Shells 

Heat your oven to 425°F (220°C) with a rack in its middle position, and lightly grease a 9-by-13-inch baking dish.

If starting with a whole squash, trim both ends, separate its narrow neck from its round base, peel each section, and scoop seeds from that round section before cutting everything into ¾-inch cubes.

Working with shorter pieces on a flat cut side gives you more control than wrestling a whole squash across a cutting board!

Toss squash with 2 tablespoons olive oil, ½ teaspoon of the filling salt, and ¼ teaspoon pepper, then spread it across a large rimmed sheet pan in one layer.

Roast for 30 to 35 minutes, turning after about 20 minutes, until a fork slips through easily and several sides have brown patches; a crowded pan or particularly firm squash may need another 5 to 10 minutes.

Don’t skip browning, because it gives your filling a fuller flavor and lets excess moisture escape. If cubes sit shoulder to shoulder, use two pans and rotate them halfway through roasting.

While squash roasts, bring about 4 quarts water to a boil, add pasta-water salt, and cook 28 shells according to package directions for a baked pasta dish.

If your package only lists an al dente time, stop about 2 minutes earlier, usually after roughly 9 to 10 minutes, depending on brand.

A shell should open without cracking while still feeling firm through its thickest ridge.

Stir gently during those first few minutes to keep shells from nesting, then drain, rinse briefly under cool water so you can handle them, and spread them on a tray with 1 teaspoon olive oil. A tangled mound makes stuffing much more annoying than it needs to be!

Melt butter in a medium saucepan over medium heat, then cook for about 4 to 6 minutes total, swirling frequently, until foaming butter reveals golden-brown specks and smells nutty.

Watch closely once those specks appear, because butter keeps browning in a hot pan. Move your saucepan off heat, stir in sage for about 20 seconds, and add garlic for another 20 seconds; residual heat should make both fragrant.

If butter smells acrid or its specks have turned black, start this step again. Burned butter will carry that bitterness through every spoonful of sauce.

Stir flour into fragrant butter, return your saucepan to medium-low heat, and whisk for 1 minute. Slowly add milk in several additions, whisking each addition smooth before pouring more, then whisk in broth, sauce salt, and pepper.

Bring to a gentle simmer over medium heat and cook for 4 to 6 minutes, stirring across bottom and corners, until sauce lightly coats a spoon but still pours in a broad ribbon. Take it off heat and stir in lemon juice.

I would keep this sauce slightly loose, since pasta absorbs liquid as it bakes; if it falls from your spoon in thick dollops, whisk in milk, 1 tablespoon at a time.

When squash is ready, lower oven temperature to 375°F (190°C) and let roasted cubes cool for about 5 to 10 minutes, until warm rather than piping hot.

Mash with a fork or potato masher and measure 2 cups, approximately 450 g, into a bowl, saving any extra for another meal. Your mash should hold a soft mound without releasing liquid.

If it looks watery, stir it in a wide skillet over medium heat for 3 to 5 minutes to evaporate moisture, then cool again before continuing.

Mix measured squash with drained ricotta, ½ cup Parmesan, lemon zest, nutmeg, and remaining ¼ teaspoon filling salt. Taste now and adjust salt or pepper if needed, then stir in your egg until evenly combined.

Taste before adding raw egg! You should have about 3¾ to 4 cups of thick, spoonable filling that stays where you put it. My preference is a gently savory filling with a clear squash flavor, so keep nutmeg to that small pinch instead of letting it take over dinner.

Spread 1 cup sauce across your prepared baking dish. Hold each cooled shell open in one hand and spoon about 2½ tablespoons filling inside, dividing any remaining filling among 24 shells, then arrange them opening-side up in a snug single layer.

Four rows of six usually fit, although shell shapes vary.

Nestle them together without crushing their sides, pour remaining sauce over and around them, and scatter mozzarella and remaining ¼ cup

Parmesan evenly across tops. If one shell splits, tuck its broken side against its neighbor. Pasta does not need a flawless attendance record!

Cover your dish with lightly greased foil, tenting it enough to keep cheese from sticking, and bake at 375°F (190°C) for 20 minutes.

Uncover and bake for another 15 to 20 minutes, until sauce bubbles toward center and cheese has melted with a few golden spots.

Check a central shell with an instant-read thermometer; its filling should reach 165°F (74°C), consistent with FoodSafety.gov guidance for casseroles.

If cheese browns before filling is hot, loosely cover and keep baking. For extra browning once hot, a broiler-safe dish can go under a preheated broiler for 1 to 2 minutes, watched continuously.

While shells bake, heat 2 teaspoons olive oil in a small skillet over medium-low heat, add panko and chopped pepitas, and stir for 4 to 6 minutes, until crumbs turn golden and seeds smell toasted.

Sprinkle with a small pinch of salt and immediately transfer to a plate so residual heat does not scorch them. Save this mixture for serving; adding it before baking would let those carefully toasted crumbs soak up sauce.

Let baked shells rest for 10 minutes, giving filling time to settle and sauce a chance to thicken slightly around each portion.

Scatter toasted pepita breadcrumbs over servings just before carrying them to your table, then spoon a little sauce from your baking dish alongside each portion.

That first forkful should have tender pasta, creamy squash, fragrant sage, and a crisp little finish. Dinner is ready!

Small Adjustments That Help!!

• If you use precut squash, weigh it after trimming and cut oversized pieces down to ¾ inch so everything cooks at a similar pace. Precut squash saves peeling time while giving you those same roasted edges.
• If fresh sage is unavailable, use 1 teaspoon dried rubbed sage in sauce. Stir it in with garlic, and keep an eye on your pan because dried herbs can darken quickly in hot butter.
• If shells look dry before baking, loosen sauce with a splash of milk and spoon it over exposed pasta edges. Under a foil cover, that moisture helps firm pasta finish cooking without turning leathery.

Serving Suggestions

Serve four shells per person with arugula or mixed greens tossed in lemon vinaigrette, adding thin apple slices if you want a fresh crunch alongside creamy pasta.

Garlicky green beans or roasted broccoli also work beautifully, especially when finished with a squeeze of lemon. I would choose one bright vegetable side and keep it simple so those golden shells have plenty of room on each plate!

For a holiday table, serve two shells as a side portion, giving you approximately 12 smaller servings. Warm bread is welcome for scooping up sauce, and extra toasted crumbs can go into a small bowl so everyone can add their own crunch.

Spoon these butternut squash stuffed shells onto your plate while sauce is warm and cheese still stretches, then let toasted pepitas crackle against that soft, golden filling!

With roasted squash, a little lemon, and fragrant brown butter sage sauce in every bite, this is a dinner worth taking your time over.

Save yourself a corner shell and enjoy every last creamy forkful!