In a large mixing bowl combine all ingredients but only half the ketchup (2 tbsp reserved for topping later). Use hand or spoon to mix well until incorporated.
Transfer to the bottom of a slow cooker. Use hands to form into the shape of a loaf. Make two foil balls to wedge on both long sides of the meatloaf to help keep its shape.
Set the slow cooker for low heat, six hours. When finished, top with additional ketchup if desired (no more than 2 tablespoons).
Sliced meatloaf and serve with green beans or creamy mashed cauliflower.