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.

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.

Remove squash from oven after 30 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.

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.

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.

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.

Place back in the oven to bake for 15 more minutes. Remove and serve.