Peel apple 1/4 at top and core, taking care not to remove the bottom of the apples.
Mix raisins, cranberries and nut. Fill center of apples. Top each apple with about 1 tsp. butter. Mix cinnamon and sugar and set aside.
Drizzle maple syrup over the apples; sprinkle with mixture of cinnamon and sugar.
Cover, place on Slow Cooker base and cook on #4 for 30 to 40 minutes or until apples are fork tender. Do not overcook as the apples will lose their shape.
Remove apples to serving dishes. Place 2 qt. Slow Cooker utensil on the stove top on medium heat. Cook liquid until it thickens, 6- 8 minutes. Drizzle sauce over apples. Sprinkle crushed ginger snaps on top and serve.