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1
Grease and flour a 10- to 12-cup Bundt pan. Heat oven to 350u00b0.
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2
Melt butter in a large saucepan over medium-low heat; add cocoa, stirring until smooth. Whisk in the water and remove from heat.
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3
To the warm cocoa mixture, add the sugar, sour cream, 1 tablespoon vanilla, and eggs; whisk until smooth.
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4
In another bowl combine the flour, soda, and salt. Add all at once to the first mixture, whisking until well blended.
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5
Pour batter into prepared pan. Bake for 40 to 45 minutes, or until it feels firm to the touch and has slightly pulled away from the sides of the pan.
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6
Cool in pan on a rack for 20 minutes. Carefully loosen the cake with a knife and invert onto a large plate and cool completely.
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7
For the Peanut Butter Mousse:
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8
In the bowl of your mixer whip heavy cream until whipped cream forms. Remove from mixer bowl and place in a large glass bowl.
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9
Return mixer bowl to your mixer and beat cream cheese until completely smooth. Add powdered sugar and peanut butter and beat until completely incorporated.
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10
Slowly and gently fold the whipped cream into the peanut butter/sugar mixture until completely incorporated. Refrigerate until ready to assemble cake.
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11
Prepare the Glaze:
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12
Chop chocolate and put in a small bowl; set aside.
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13
Combine remaining heavy whipping cream, corn syrup, and 1 teaspoon vanilla extract in a small saucepan. Cook the mixture, stirring, until mixture boils.
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14
Pour over the chocolate and whisk until smooth. Let cool to room temperature. If too thick, thin with a little more cream.
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15
Assemble Cake:
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16
With bundt cake sitting on its flat side, slice cake in half horizontally. Remove the top layer and set aside.
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17
Spread half of the peanut butter mousse on the bottom layer. Top with the other cake layer. Cover top of the cake with the remainder of the peanut butter mousse.
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18
Pour and spread the chocolate glaze on top of the mousse. Refrigerate until ready to serve.
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19
* (Note) If you're using a standard baking cocoa (not Dutch-process or high-quality) add 1/2 teaspoon more of baking soda to the dry ingredients.
