Cheesy Spaghetti Squash Casserole

This Spaghetti Squash Casserole was a big hit at a potluck recently where there were more than a few vegetarians around the table, and it would be a welcome addition during the holidays.

What's not to love about a tender squash, creamy cheese, fresh sage, and red peppers?

What Is Spaghetti Squash?

Just to be clear, spaghetti squash is a vegetable! It looks a bit like a large, yellow melon, but when you cut it open, pale yellow spaghetti-like strands lurk under the seeds. You could say spaghetti squash is kind of cool.

But let’s be perfectly honest. It's also a bit on the bland side, in the way zucchini is bland, but with a totally different texture.

Unlike the bold, intense flavors of butternut or acorn squash, spaghetti squash is like a blank canvas, waiting to be infused with flavors. It’s a great alternative for 'squash haters'—they will immediately be converted when they taste this cheesy casserole.

How To Cut and Cook a Spaghetti Squash

Spaghetti squash is a member of the gourd family, which means the outer shell is very tough. I use a few tricks to make cutting the squash easier. When you are finished cutting it, you want two long halves.

• On a cutting board, set the squash on a folded dishtowel to keep it stable.
• Hold the squash steady with one hand, and insert a large chef’s knife into the center of the squash the long way, and push it down to cut the squash in half.
• If you find you have trouble cutting the squash into even halves, try first scoring a line or making several deep slits with your knife around the squash (from end to end) and then use that as a guide for cutting.
• Once you have two halves, scrape out the seeds with a sharp-edged spoon and discard (or roast) the seeds. Place the halves with the cut sides down on a parchment lined baking sheet and bake.

Make Ahead Tips for This Casserole

OPTION 1: Prep the different components ahead of time.

• You can prepare the components of the casserole (bake the squash, make the egg and cream mixture, cook the peppers and onions, grate the cheese) up to three days ahead of time and store each component separately in the refrigerator. Assemble and bake as directed in the recipe.

OPTION 2: Refrigerate the baked casserole.

• Assemble and bake the casserole. When cooled to room temperature, cover with plastic wrap and refrigerate for up to three days. Reheat in a 350oF oven for 20 minutes, or until the casserole is hot all the way through.

OPTION 3: Freeze the baked casserole.

• Assemble and bake the casserole. When cooled to room temperature, cover with plastic wrap and then foil, and freeze for up to two months. Defrost in the refrigerator overnight and bake at 350oF for 20 minutes, or until the casserole is hot all the way through.

Need More Vegetarian Recipes?

• Vegetarian Shepherd’s Pie
• Vegetarian Spinach and Mushroom Lasagna
• Scalloped Turnips
• Carrot Soufflé
• Vegan Stuffed Squash with Brown Rice and Mushrooms