Vegetable oil cooking spray
6 small Granny Smith apples, washed and scrubbed (see Cook's Note)
Two 11-ounce bags soft caramel candies (about 80 caramels)
One 11-ounce bag white chocolate chips
1 cup semisweet chocolate chips
To help the caramel stick to the apples, wash the apples well in water mixed with a small amount of white vinegar.