In the bottom of a large slow cooker, stir together the apples, cinnamon, allspice, and nutmeg.
In a medium mixing bowl, whisk together milk, 2 tablespoons softened butter, sugar, eggs, vanilla, and 1/2 cup baking mix. Batter will be lumpy. Pour over apples.
In a separate mixing bowl, stir together remaining 1 cup baking mix and brown sugar. Using a pastry blender or two knives, cut in 3 tablespoons cold butter until evenly crumbly.
Sprinkle over ingredients in Crock-pot.
Cover and cook on low 6 – 7 hours or until apples are soft.