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Preheat oven to 425° Fahrenheit.
Remove squash from oven after 30 minutes and set aside to cool. Keep the oven on at 425°.
While the squash is cooling, prepare the creamy garlic sauce. 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 the arrowroot flour and minced garlic and stir around to mix well with the mushrooms, about 1-2 minutes.
Next, add in coconut milk, stirring constantly for 2 minutes. Be sure to mix well to dissolve all of the flour into the milk (you don't want any flour clumps). Use a whisk to mix if needed. The sauce will bubble and thicken, keep stirring to prevent burning. After 2 minutes turn heat down to low and simmer. Stir in salt and pepper.