Pre-heat oven to 375 degrees. Split squash in half and remove seeds. Place squash open end down on a baking sheet and cook for 20 minutes or until softened.
Meanwhile, spray a skillet with nonstick spray & add ground meat. Once cooked, add in the marinara sauce. When squash is done cooking, run a fork through squash to create "spaghetti noodles". Serve with marinara and meat sauce.