Buffalo Chicken Stuffed Spaghetti Squash

1 ¼ lbs chicken breast, cooked and shredded 1 medium spaghetti squash, halved (about 3 lbs.) 2 stalks celery, thinly sliced 2 green onions, white and green parts thinly sliced ½ cup diced red bell pepper ½ cup buffalo Sauce ¼ cup ranch optional: ¼ cup crumbled blue cheese (omit for Whole30) squash: Preheat oven to…