Preheat oven to 375 degrees. Spray 8x8 baking pan with nonstick spray.
Cut squash in half lengthwise. Scoop out insides. Drizzle inside of each half with olive oil and lay face down on baking sheet.
Bake until outside of squash is tender. Remove from oven and let cool until you can pick it up easily. Scrape out insides into a large bowl.
Add a little olive oil to skillet. Cook chicken in skillet until almost cooked, then add the mushrooms. Continue cooking until chicken is fully cooked and mushrooms are softened.
Add sour cream, cream cheese, and remaining seasonings. Cook and stir until cream cheese is melted and everything is combined.
Add contents of skillet to the spaghetti squash and stir to combine.
Transfer to the baking pan. Sprinkle with parmesan cheese.
Bake for 15 minutes.
Notes
My family loves this dish, so I double the recipe and use a 9x13 baking pan.
Keyword chicken, gluten free, Main Course, spaghetti squash