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1
In a saucepan, bring 1/2 cup butter, 1 cup cola and baking choclate to a boil.
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2
Remove from heat and stir in marshmallows until dissolved.
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3
Set aside and allow to cool to room tempurature.
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4
In a bowl, combine flour, 3/4 cup cocoa powder, baking powder, baking soda, and salt. Set aside.
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5
With an electric mixer, beat together sugar, shortening, oil and 2 tsp vanilla until fluffy.
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6
Add eggs, buttermilk, and beat until smooth.
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7
Add 1/2 of the dry mixture into the wet mixture and beat until smooth, scaping the sides of the bowl often.
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8
Add colled cola mixture and beat.
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9
Add remaining dry mixture and beat for 4 minutes. Batter will be thick.
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10
Pour batter into a greased and floured 13 x 9 x 2 baking pan.
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11
Bake on top rack of a 350 degree oven for 35-40 minutes or until toothpick inserted in center comes out clean.
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12
Cream butter with electric mixer.
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13
Add 1/2 cup cocoa powder, 1/4 cup cola, choclate syrup and 1 tsp vanilla and beat until smooth.
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14
Slowly add powdered sugar, scaping the sides f the bowl often, while beating with the mixer.
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15
If frosting seems dry, add small amounts of cola until you reach desired consistency.
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16
Frost cake while warm.
