01 - 
                Preheat oven to 375 degrees.
              
              
              
                02 - 
                Cut squash in half and scoop out the seeds with a spoon. Season the spaghetti squash with a little bit of olive oil, salt and pepper.
              
              
              
                03 - 
                Lay skin side down on a rimmed sheet pan that is lined with aluminum foil.
              
              
              
                04 - 
                Cut your chicken breast so you have four pieces of chicken. Place the chicken on the sheet pan, season with salt and pepper.
              
              
              
                05 - 
                Bake for 45 mins or until cooked to a touch with a fork. When the squash is cooked Scrape the flesh with a fork to create noodles and dice your chicken in to small pieces.
              
              
              
                06 - 
                While the chicken and squash are cooking place the onions with the butter in a pan on the stove over medium low heat until very soft.
              
              
              
                07 - 
                Once everything is cooked combine the spaghetti squash noodles, chicken, onion, yogurt, 1 cup of the cheese, salt and pepper in a large bowl.
              
              
              
                08 - 
                Place the mixture back into the empty shells and top with the remaining cheese and place under the broiler until golden brown.