I cooked this on low for about four hours. I removed the lid and placed a towel underneath to help remove the moisture and increase the "crispness". The addition of the butterscotch pudding gives this a wonderful caramel flavor. While this doesn't have quite the same crunch and as one baked in the oven, it makes a delicious dessert and you can't beat the smell of the apples cooking in the kitchen.

Recipe courtesy of CD Kitchen
5 large sliced peeled tart apples
3/4 cup packed brown sugar
1/2 cup all-purpose flour
1/2 cup quick-cooking oats
1 package (3-1/2-ounce size) cook-and-serve butterscotch pudding mix
1 teaspoon ground cinnamon
1/2 cup cold butter or margarine
Vanilla ice cream or Whipping Cream -- optional
PREPARATION:
Place apples in a 3-qt. slow cooker.
In a bowl, combine the brown sugar, flour, oats, pudding mix and cinnamon. Cut in butter until mixture resembles coarse crumbs. Sprinkle over the apples.
Cover and cook on low for 5 hours or until apples are tender. Serve with ice cream or whipping cream, if desired.
I am linking this to Tasty Tuesday, Tuesday's at the Table, Tempt My Tummy Tuesday and Tuesday Night Supper Club.