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