Preheat oven to 350F (180C).
Spray a 12 cup fluted bundt pan or a 10-inch tube pan with non-stick spray and lightly dust with flour.
In a large bowl, use a whisk to beat cake mix, dry pudding mix, water, eggs, and oil until blended. Whisk for about 2 minutes.
Gently stir in the apples.
Pour the cake batter into the prepared pan and bake for 50 minutes to 1 hour, or until a toothpick inserted into the centre of the cake comes out clean. The cake was finished in 50 minutes in my oven.
Cool the cake in the pan on a wire rack for 20 minutes, then invert the pan and remove the cake. Cool the cake completely on the wire rack.
Make the caramel drizzle: Unwrap the caramels and microwave them along with the milk in a microwaveable bowl on high for 1 ½ minutes, stirring every 30 seconds, until blended. (You might need a few extra seconds). Cool for 30 minutes until slightly thickened. Drizzle over cake.