Butterfinger Cupcakes

Name: Butterfinger Cupcakes
Prep time: 1 min
Cook time: 20 min
Total time: 1 min
Ingredients: 1/2 cup (104g) sugar; 1/4 cup (36g) brown sugar; 1/4 cup (56g) unsalted butter, room temperature; 1/2 cup (140g) creamy peanut butter; 1/4 cup (58g) sour cream, room temperature; 1 tsp vanilla extract; 3 large egg whites, room temperature; 1 1/4 cups (163g) all-purpose flour; 2 tsp baking powder; 1/4 tsp salt; 6 tbsp (90ml) milk, room temperature; 2 tbsp (30ml) water, room temperature; 1/2 cup crushed butterfingers; 5 oz (142g) semi sweet chocolate chips; 6 tbsp (90ml) heavy whipping cream; 1/2 cup (112g) salted butter; 1/2 cup (140g) peanut butter; 1/4 cup (48g) shortening; 3 1/2 cups (403g) powdered sugar; 3-4 tbsp (45-60ml) water or milk; 3/4 cup crushed butterfingers