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1
Cake:
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Preheat oven to 350u00b0F Butter and flour three 9-inch-diameter cake pans. Line the bottoms with parchment paper, then butter and flour the parchment paper. (Or, line cupcake pans with paper liners).
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3
In large bowl, cream together butter and sugar with electric mixer. Add peanut butter and vanilla and cream well. Add eggs one at a time, mixing well after each.
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4
In separate bowl, whisk together dry ingredients.
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Add dry ingredients to peanut butter mixture alternately with sour cream and milk. Mix on low speed just until blended.
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Pour cake batter into prepared pans (approximately 2 cups per pan), spreading evenly in pans. (Or, fill cupcake cups 2/3 full).
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Bake for 15-20 minutes or until tester inserted into center of cake comes out clean. Do not over bake. Remove from oven and cool cakes in pans on rack 10 minutes.
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Run small sharp knife around pan sides to loosen cakes. Turn cakes out onto racks and cool completely.
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9
Frosting:
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In large mixing bowl, beat butter until creamy. Add marshmallow creme, milk and vanilla extract and mix well. Slowly add powdered sugar a little at a time, mixing well after each addition. Add additional powdered sugar, if needed, to reach desired consistency.
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Frost cake or cupcakes. Sprinkle with chopped peanuts.