→ Cookie Base
                    
                      
                        01 - 
                        8 tablespoons (1 stick) unsalted butter, brought to room temperature
                      
                    
                      
                        02 - 
                        ⅓ cup white sugar
                      
                    
                      
                        03 - 
                        ⅔ cup packed light brown sugar
                      
                    
                      
                        04 - 
                        2 large eggs
                      
                    
                      
                        05 - 
                        1½ teaspoons pure vanilla extract
                      
                    
                      
                        06 - 
                        2 cups all-purpose flour
                      
                    
                      
                        07 - 
                        ¾ teaspoon baking soda
                      
                    
                      
                        08 - 
                        1 teaspoon kosher-style salt
                      
                    
                      
                        09 - 
                        1 cup semi-sweet chocolate chips, plus 2 extra tablespoons, divided
                      
                    
                  
                    → Frosting with Chocolate
                    
                      
                        10 - 
                        4 tablespoons (½ stick) softened unsalted butter
                      
                    
                      
                        11 - 
                        1 tablespoon plus 1 teaspoon milk
                      
                    
                      
                        12 - 
                        2 tablespoons cocoa powder, unsweetened
                      
                    
                      
                        13 - 
                        ¼ teaspoon clear vanilla extract
                      
                    
                      
                        14 - 
                        1 cup powdered sugar
                      
                    
                      
                        15 - 
                        2 tablespoons colorful sprinkles