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Preheat oven to 350 degrees and line 2 muffin tins with cupcake liners.
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Peel and finely chop peaches and set aside.
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Add the Pillsbury Purely Simple White Cake & Cupcake Mix to a mixing bowl. Add the butter and sour cream. Beat on medium until incorporated.
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Add eggs one at a time, beating well after each.
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Add the chopped peaches and mix on low until incorporated.
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Use an ice cream scoop to evenly fill the muffin tins.
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Bake for 20-25 minutes until a toothpick comes out clean in center.
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To Make Peach Buttercream Icing
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Peel peach and remove pit. Add to a food processor to lightly puree. Just pulse a few times.
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Add icing mix to a mixing bowl along with butter. Beat on medium until incorporated.
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Add peach puree and beat on medium high until light and fluffy.
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If needed, add water if icing is too thick, one tablespoon at a time until desired consistency is reached.
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Using a pastry bag and star decorator tip to pipe on cooled cupcakes.
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Garnish with peach slice.