Coat a large skillet with cooking spray. Brown sausage until cooked through. Remove sausage from heat; transfer to a large mixing bowl. Crumble sausage. Melt butter in the skillet; saute onion for 2 to 3 minutes, until translucent. Add celery, apples, garlic and poultry seasoning; cook for 3 to 5 minutes, stirring often. Add apple-vegetable mixture and stuffing mix or bread to bowl of sausage; mix well. Moisten with chicken broth; season with salt and pepper. Let cool completely before stuffing the turkey.