1 (18.25 ounce) box yellow cake mix
10 fun-size Milky Way bars, divided
1 (14 ounce) can sweetened condensed milk
1 (12 ounce) jar caramel ice cream topping
1 (12 ounce) carton Cool Whip, thawed
Prepare and bake cake according to package directions, using a greased 13 x 9-inch pan.
Chop six candy bars. Remove cake from oven and immediately sprinkle with chopped candy bars. Cool on wire rack for 10 minutes.
Using the end of a wooden spoon handle, poke 20 holes in warm cake. Pour milk over cake; cool for 10 minutes.
Pour ice cream topping over cake; cool completely. Spread whipped topping over cake. Chop remaining candy bars; sprinkle over cake. Cover and store in the refrigerator.