1In large bowl, toss together apple slices, cinnamon, allspice and nutmeg. Place apple mixture in lightly greased slow cooker.
In bowl, combine milk, softened butter, sugar, eggs, vanilla and 1/2 cup biscuit baking mix. Spoon over apples.
2In small bowl, combine remaining baking mix with brown sugar. Cut in cold butter until mixture is crumbly. Sprinkle over ingredients in slow cooker. Cover and cook on Low for 6 to 7 hours, or until apples are tender when pierced with fork.