Carefully slice spaghetti squash in half and scrape seeds and pulp. Place half in a microwave for 15 minutes.
While squash is heating, mince garlic and slice onions, carrots, celery, mushrooms, cabbage, and chicken.
In a heated skillet over medium-high heat, brown chicken pieces on all sides.
When cooked through, add garlic, onions, and celery. Cook for 2-3 minutes until onions begin to be translucent.
Add carrots, cabbage, and mushrooms, and gently stir fry until cabbage is softened.
Add soy sauce, brown sugar, sesame oil, and sesame seeds. Stir until mixed through.
Remove cooked spaghetti squash from microwave with a towel or pot holder (it will be very hot). Place paper towels or a kitchen towel on the spaghetti squash and press the extra water from the squash.
Use a fork to scrape the spaghetti squash strands into the skillet with the rest of your ingredients. Stir to combine.
Optional: garnish with sesame seeds, chopped green onions, and cashews