If you’re craving a creamy pasta bake, this one hits the spot! With spaghetti squash in place of the noodles, it’s extra garlicky and creamy with no cheese in it.

This was a huge hit in my house. My picky toddler ate three helpings and even the broccoli (cue mama happy dance). Will definitely be in the rotation. I used defrosted broccoli florets and added onion while cooking the sausage.

Taylor

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Key ingredient notes

Full-fat coconut milk: Use unsweetened, full-fat coconut milk or coconut cream. We use Aroy-D, Native Forest or Thai Kitchen. Watered down coconut milk or almond milk won’t thicken, and the sauce tends to come out watery.
Does it taste like coconut? Not really, and most reader comments agree. There’s a lot of garlic in the sauce and it covers the coconut.
Italian sausage or a substitute: Ground Italian sausage adds seasoning and leaves some fat in the pan for the sauce. Breakfast sausage or chorizo work too. If you use ground chicken or turkey, you’ll want to add some seasonings and a little oil to the pan.

Angled close up image of spaghetti squash casserole in dish with serving spoon.

Recipe tips and testing notes

  • Don’t overcook the squash: Take it out at 25 minutes, even if the strands are still a little firm. They finish cooking in the casserole, and overcooked squash can release water and make the whole dish soupy. If your squash is on the smaller size, cook for less time (around 20 minutes).
  • Broccoli: It goes in raw and bakes to crisp-tender, which is how we like it. If you want it softer, add it to the skillet with the mushrooms or steam it for a few minutes first. Fresh broccoli works best, since frozen can make the casserole watery.
  • Whisk the arrowroot in first: Whisk it into the coconut milk before it goes in the skillet, then keep stirring while the sauce bubbles so it doesn’t clump or scorch. Cornstarch or tapioca starch work in place of arrowroot. Skip coconut flour, it soaks up too much liquid.
  • If you do dairy: Heavy cream or whole milk both work in place of the coconut milk.
  • Cutting the squash: It’s the hardest part of the prep. Cut it in half crosswise for the longest noodles (see our how to cook spaghetti squash post for more details).
  • Make it ahead: You can put this sausage dinner recipe together earlier in the day and bake it at dinner time. Give it a few extra minutes in the oven since it’s going in cold.
  • Freezing: Freeze it before the final baking step, then let it thaw it completely before baking again to warm it up. If any water pools after thawing, drain it off first.
Overhead vertical image of casserole dish filled with creamy garlic spaghetti squash and a serving spoon.

More spaghetti squash dinners

If you like this one, our creamy bacon ranch chicken casserole is a similar spaghetti squash bake with ground chicken, bacon and broccoli in a homemade ranch sauce.

For pizza night, try our spaghetti pizza casserole. It’s layered with ground beef, spaghetti sauce and pepperoni. We make this one often at home and our daughter loves it!

If you’d rather not put together a casserole, our shrimp and broccoli spaghetti squash alfredo goes straight into bowls. The shrimp cooks in a skillet and a creamy dairy-free sauce made in the blender goes over the top.

For more ideas, check out our roundup of 10 cozy spaghetti squash recipes.

A casserole dish filled with a creamy garlic spaghetti squash casserole, baked with broccoli, sausage and green onions, with a serving spoon resting inside.
4.39 from 543 ratings
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Creamy Spaghetti Squash Casserole (Dairy-Free)

For this spaghetti squash casserole we use a creamy garlic sauce made with coconut milk, so it's dairy-free. Italian sausage, mushrooms and broccoli get mixed in with the squash noodles, and you'll have the whole casserole out of the oven in about an hour.

Ingredients

Instructions
 

  • Preheat oven to 400° Fahrenheit.
  • Slice the spaghetti squash lengthwise and scoop out the seeds. Place the two halves face-down on a baking sheet and bake for 25 minutes.
    1 medium spaghetti squash
  • While the squash is cooking, get the sausage going. Heat a large pan over medium heat and add in the sausage. Break it into pieces with a spatula and cook, stirring occasionally, until browned and cooked through, about 8 minutes. Remove from pan and set aside. Reserve at least 1 tbsp of fat in the pan for the sauce you’ll make later.
    1 lb ground Italian sausage
  • Remove squash from oven after 25 minutes and set aside to cool. Keep the oven on at 400°.
  • While the squash is cooling, prepare the creamy garlic sauce. Whisk together coconut milk and arrowroot flour in a bowl or jar and set aside.
    16 oz coconut milk, 1/4 cup arrowroot flour
  • Heat the same pan you cooked the sausage in over medium heat. Once hot, add mushrooms and cook until they begin to soften, about 2 minutes. Add in minced garlic and mix well with the mushrooms, about 1-2 minutes, until fragrant.
    2 cups mushrooms, sliced, 2 tbsp minced garlic
  • Next, whisk up the coconut milk mixture again and add to pan, stirring constantly for 2 minutes. The sauce will bubble and thicken, keep stirring to prevent burning. After 2 minutes turn heat off and stir in salt and pepper. 
    Salt and pepper
  • Now, put it all together. With a fork, scrape out the spaghetti squash “noodles” into a medium casserole dish. Add the cooked sausage, broccoli, and creamy garlic sauce. Mix everything together well.
    4 cups broccoli florets
  • Place back in the oven to bake for 15 more minutes. Remove and serve.

Last Step:

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Notes

  • Nutrition estimates are per serving and an estimate provided for reader benefit.  See our full nutrition information disclosure here.  
Calories: 511kcal, Carbohydrates: 24g, Protein: 16g, Fat: 41g, Fiber: 5g, Calcium: 101mg, Iron: 5mg
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