Preheat oven to 400 degrees.
Cut your squash in half vertically.
Drizzle the flesh side of the squash with the oil, salt, and pepper. Place them cut side down on an aluminum foil lined sheet pan. Bake for 30 minutes, or until tender.
Remove the squash from the oven and gently break up the flesh into noodles. Place the spaghetti squash noodles into a large mixing bowl.
Stir the chicken, cheese, hot sauce, yogurt, jalapeno, whites of the green onions, salt, and pepper into the noodles.
Divided the mixture into the two shells of the squash.
Top the squash with the second addition of cheddar cheese.
Place them under the broiler until they get golden brown.
Drizzle the top with some ranch and the greens of the green onions.