Loretta Lynn's Gooey Cake

1 box German chocolate cake mix
1 can sweetened condensed milk
1 cup Cool Whip
3 Heath candy bars, frozen
1 jar caramel topping

Prepare and bake cake according to package directions, using a 13 x 9-inch cake pan. While warm, poke holes halfway into cake about 1 inch apart. Pour sweetened condensed milk into holes. Pour caramel topping over cake and refrigerate.

When cool, top with Cool Whip and crushed Heath candy. Refrigerate overnight before serving.