2
                        chicken breasts, cut crosswise in half and pounded to 1/2-inch thickness
                                        
                        
                        1 teaspoon
                        kosher salt, divided
                                        
                        
                        1/2 teaspoon
                        ground black pepper
                                        
                        
                        1
                        small clove garlic (or 1/2 of a larger clove)
                                        
                        
                        1/2 cup
                        fresh herbs (I used 2 tablespoons each basil, chives, cilantro, and parsley)
                                        
                        
                        1
                        avocado, peeled and pitted
                                        
                        
                        7 ounces
                        Greek yogurt
                                        
                        
                        1 tablespoon
                        honey
                                        
                        
                        2 teaspoons
                        fresh lemon juice
                                        
                        
                        2 teaspoons
                        white balsamic vinegar
                                        
                        
                        1/4 teaspoon
                        ground white pepper
                                        
                        
                        4
                        hamburger buns or sandwich rolls
                                        
                        
                        1 cup
                        fresh baby spinach leaves