I found this recipe on pinterest some time back and I've made it a couple of times now. This time I changed it up a bit...just in the frosting part...I've included the pinterest link below the recipe.
CHOCOLATE FUDGE BROWNIE CAKE
1 box chocolate cake mix
1 box fudge brownie mix (9"x13" size mix)
1 1/4 cups water
1 cup oil
Preheat oven to 350 degrees. Prepare a bundt pan by spraying with a non-stick cooking spray...I like *Baker's Joy.
Combine all ingredients in mixer bowl and mix well to combine thoroughly.
Pour into prepared pan.
Bake 50-55 minutes.
Allow to cool for a bit before turning out of pan.
Melt 6 ounces semi-sweet chocolate plus 4 tablespoons whipping cream, stir to smooth consistency.
Pour over cake. As you can see, I topped with a handful of chopped pecans.