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1. Preheat oven to 350 degrees and line pans with cupcake liners.
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2. Beat butter and sugar for 3 minutes, scrape bowl as needed.
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3. Add egg whites one at a time on low until fully incorporated.
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4. In a separate bowl, sift flour, baking powder, baking soda and salt together.
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5. Alternate adding buttermilk and the dry ingredients to the butter/sugar mixture.
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6. Mix in sour cream.
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7. Fold in jimmies and fill liners 3/4 full.
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8. Bake for 16-22 minutes, or until and inserted knife comes out clean.
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9. Buttercream: Beat butter and cream cheese. Add strawberry puree, gelatin and vanilla extract. Slowly add powdered sugar until you reach your desired consistency.
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10. Pipe buttercream onto cooled cupcakes.