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Spaghetti Squash Casserole in the Shell

Rated as 4.62 out of 5 Stars

"I love almost any squash recipe, and this one makes a great meal all by itself! Quick, easy, and one of my favorite ways to make spaghetti squash!"
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1 h 51 m servings 236
Original recipe yields 6 servings


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  1. Preheat oven to 375 degrees F (190 degrees C). Place squash in baking pan; pour in enough boiling water to come 1/2-inch up the sides of dish.
  2. Bake in the preheated oven until squash is tender, 40 to 45 minutes. Remove from oven; cool until easily handled, 7 to 10 minutes.
  3. Reduce oven to 350 degrees F (175 degrees C). Scoop out squash; separate strands with a fork. Reserve shells.
  4. Cook beef, onion, and bell pepper in a skillet over medium heat until the meat is no longer pink, about 5 minutes; drain. Stir in garlic, basil, oregano, salt, and pepper; cook and stir until fragrant, about 2 minutes. Add tomatoes and cook until warmed through, about 2 minutes. Stir in squash; cook until liquid has evaporated, about 10 minutes.
  5. Fill squash shells with squash mixture using a slotted spoon; place in a shallow baking pan.
  6. Bake in the preheated oven until flavors combine, about 15 minutes. Sprinkle with Cheddar cheese; bake until cheese is melted, about 5 minutes.


  • Cook's Notes:
  • Any ground meat can be substituted for ground beef. You can substitute mozzarella cheese instead of Cheddar.
  • As a side dish this can serve 8 to 10, or it can be used as a main dish and serve 4 to 6.

Nutrition Facts

Per Serving: 236 calories; 12.5 12.8 18 58 414 Full nutrition

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  1. 226 Ratings

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Most helpful positive review

Spaghetti squash can be very difficult to cut in half so I poked it with a few pricks of a fork and microwaved it for five minutes and then just let it sit for about 10 to 15 minutes and it was ...

Most helpful critical review

Very bland. I think it needed twice the spices and perhaps some tomato paste.

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Least positive

Spaghetti squash can be very difficult to cut in half so I poked it with a few pricks of a fork and microwaved it for five minutes and then just let it sit for about 10 to 15 minutes and it was ...

Very good! Loved it. Made a few changes. Used more onion, bell pepper and garlic. Added one container baby bella mushrooms. Sauteed onions & garlic then added shrooms and bell pepper w/a tin...

To tell the truth, I was hesitant to try this because I had memories of boiled, mushy squash from childhood. My wife convinced me to try spaghetti squash... love won out and I made the dish as p...

I just harvested 30 spaghetti squash out of my garden before the 1st freeze. I managed to give away 8 of them, but now I need to try new recipes. This was very good, but I added chili powder, ...

Fantastic! This comes together so easily and effortlessly. The instructions are easy to follow and fool-proof. I added some zucchini and carrots to the meat mixture and used Parmigiano Reggiano ...

I am not vegetarian but I made this meatless and it came out absolutely fantastic! I added more onion and more peppers actually almost a little more of everything to take up the space of the mi...

This was a hit at our house! I tried the recipe exactly as written although I opted to use a casserole dish instead of the squash shells. Next time I will try doubling the garlic, peppers & onio...

I like spaghetti squash but usually just serve it with salt, pepper and butter. This was very good. The only change I made was to add some leftover portabello mushrooms that needed to be used up...

I was looking for a colorful vegetable for a dinner party. This was wonderful, flavorful and everyone loved it. I made it exactly according to the recipe.