Preheat oven to 400 degrees F.
Place the maple sausage, egg, bread crumbs and 1/4 cup maple syrup into a large mixing bowl. Stir until fully combined, do not overwork the meat or the meatballs will be tough and dense.
Shape into small meatballs about 1 1/2 inches in diameter and place on a baking sheet lined with parchment paper.
Bake until the meatballs are browned and cooked through, about 20 - 25 minutes.
Place the chili garlic sauce, remaining 1/2 cup maple syrup and soy sauce into a slow cooker and stir together.
Turn heat to low and add the cooked meatballs.
Heat the meatballs for 30 minutes and turn the slow cooker to warm before serving.