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1. Preheat oven to 350 degrees and line pans with cupcake liners.
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2. Sift cake mix, cinnamon and baking powder into a bowl and set aside.
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3. Prepare apples and place in a separate bowl with lemon juice.
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4. In a large bowl, gently whisk oil, eggs, buttermilk, sour cream and vanilla extract together.
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5. Add cake mix and stir until smooth.
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6. Fold in apple pieces.
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7. Fill cupcake liners 3/4 full and bake for 15-20 minutes, or until and inserted knife comes out clean.
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8. Cookie Dough Frosting: Beat butter, cream cheese and brown sugar for 2 minutes. In a separate bowl, sift flour and salt together. Add flour mixture to butter mixture. Add vanilla extract and slowly add powdered sugar until you reach your desired consistency. If the mixture seems too thick, add 1 tablespoon of milk and continue to beat. Use more milk if needed, but this will be a thicker frosting than normal.
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9. Pipe buttercream onto cooled cupcakes and top with chocolate chips and slices of apple. Note: dip your apple slices in lemon juice to keep them from browning.