→ For the Mushrooms
                    
                      
                        01 - 
                        8 tbsp butter
                      
                    
                      
                        02 - 
                        8 oz brown mushrooms, sliced
                      
                    
                      
                        03 - 
                        4 cloves garlic, minced
                      
                    
                      
                        04 - 
                        2 tbsp fresh parsley, chopped
                      
                    
                      
                        05 - 
                        Salt and pepper, to taste
                      
                    
                  
                    → For the Chicken
                    
                      
                        06 - 
                        4 skinless, boneless chicken breasts
                      
                    
                      
                        07 - 
                        Salt and pepper, to taste
                      
                    
                      
                        08 - 
                        1 tsp onion powder
                      
                    
                      
                        09 - 
                        1 tsp dried parsley
                      
                    
                      
                        10 - 
                        8 slices mozzarella cheese
                      
                    
                      
                        11 - 
                        ¼ cup fresh Parmesan cheese, grated
                      
                    
                  
                    → For the Creamy Garlic Parmesan Sauce (Optional)
                    
                      
                        12 - 
                        1 tbsp olive oil
                      
                    
                      
                        13 - 
                        2 large garlic cloves, minced
                      
                    
                      
                        14 - 
                        1 tbsp Dijon mustard
                      
                    
                      
                        15 - 
                        1½ cups half-and-half (or substitute with ¾ cup whole milk and ¾ cup reduced-fat cream)
                      
                    
                      
                        16 - 
                        ½ cup Parmesan cheese, finely grated
                      
                    
                      
                        17 - 
                        Salt and pepper, to taste
                      
                    
                      
                        18 - 
                        ½ tsp cornstarch mixed with 2 tsp water (optional, for thickening)
                      
                    
                      
                        19 - 
                        2 tbsp fresh parsley, chopped