An easier one is use a white cake mix, bake as directed on the box. Poke holes in the cake and mix up a 4-serving vanilla or French vanilla instant pudding mix with 1 1/2 cups of milk. Let is set a couple of minutes until it begins to thicken and then pour over the cake smooshing the pudding down in the holes with the back of a spoon. Let it set a little bit and then take a can of chocolate frosting, heat in the micro for a bit so it softens, and then pour over the top of the cake and smooth out. Eureka, Chocolate eclair cake!