In a large slow cooker, add in all ingredients except spaghetti squash. Stir to combine. Cut the washed spaghetti squash in half around the middle and scoop out the seeds. Place the squash halves face down in the slow cooker right on top of the lentils. Cover and cook on high for 4 hours or until squash is tender and lentils are cooked completely. If the lentils seem dry in any way, just stir in some water until it reaches a nice thick, consistency. Remove spaghetti squash and shred inside with a fork. Divide among bowls and add lentil sloppy joe topping. Sprinkle with cheese, if desired. Serves 4-6 depending on how hungry you are. Nutrition information provided is based on recipe evenly divided between 4 people.