Bake chocolate cake as directed (in desired shape and size cake pan). Prepare white cake, melt 15 carmels in microwave for 15 seconds on high, stir, microwave for 10 more seconds, stir add half and half, then stir till smooth. If necessary microwave for 10 more seconds. Pour and blend into cake. Bake carmel cake in same pan as chocolate cake. Slice chocolate cake into 2 layers, level off carmel cake and put between chocolate levels (putting frosting, chocolate, pecans and carmel sauce inbetween the layers and on top).