→ Cupcakes
                    
                      
                        01 - 
                        1 3/4 cups (207g) cake flour
                      
                    
                      
                        02 - 
                        3/4 teaspoon baking powder
                      
                    
                      
                        03 - 
                        1/4 teaspoon baking soda
                      
                    
                      
                        04 - 
                        1/4 teaspoon salt
                      
                    
                      
                        05 - 
                        1/2 cup (113g) unsalted butter, room temperature
                      
                    
                      
                        06 - 
                        1 cup (200g) granulated sugar
                      
                    
                      
                        07 - 
                        3 large egg whites, room temperature
                      
                    
                      
                        08 - 
                        1 1/2 teaspoons pure vanilla extract
                      
                    
                      
                        09 - 
                        1/2 cup (120g) sour cream, room temperature
                      
                    
                      
                        10 - 
                        1/2 cup (120ml) whole milk, room temperature
                      
                    
                  
                    → Filling
                    
                      
                        11 - 
                        1/3 cup (100g) Nutella
                      
                    
                  
                    → Swirled Buttercream
                    
                      
                        12 - 
                        1 cup (25g) freeze-dried strawberries
                      
                    
                      
                        13 - 
                        1 1/2 cups (340g) unsalted butter, softened
                      
                    
                      
                        14 - 
                        6 cups (720g) confectioners' sugar
                      
                    
                      
                        15 - 
                        1/3 cup (80ml) heavy cream
                      
                    
                      
                        16 - 
                        1 teaspoon vanilla extract
                      
                    
                      
                        17 - 
                        1/8 teaspoon salt
                      
                    
                      
                        18 - 
                        1/3 cup (100g) Nutella