This is a quick and wonderful cake for guests, birthdays or just you guys. It helps if you have a 12" non-stick skillet like the executive skillet from the Pampered Chef. Dont try this with a stainless pan. I love this pan for cakes because it has the simplicity of a 9x13 pan but the sexy looks of a layer cake. And the pan distributes the heats so well, there is no domed middle to mess with.
You will need a 12" non-stick oven proof skillet or a 9 x 13 pa. . Preheat oven to 350. Melt 1 Tbsp. butter in the skillet on the stove top, spreading around.
Mix cake mix, milk, eggs and 1/3 cup melted butter with a hand or standing mixer until smooth. Pour into your pan, spreading evenly. These pans are good at distributing heat so you do not get a domed cake.
Bake about 30 minutes, testing with a straw to see if done. Let cool 5 minutes, then carefully turn out onto a large platter.
Put the chocolate and half the caramel sauce in a microwave safe dish and heat for 30-45 seconds, stirring until smooth. (or use small saucepan on stove)
Pour sauce over cooled cake, smoothing out to edges so it will drip over. Add the chopped nuts . If you want to drizzle the rest of the caramel sauce over the whole thing. Now take a picture because it is beautiful and yummy!