Chicken Salad Sandwich with Herbs Recipe

• 1 tablespoon finely chopped fresh tarragon
• 3 tablespoons canola mayonnaise $
• 3 tablespoons 2% plain Greek yogurt $
• 1 tablespoon fresh lemon juice
• 1/8 teaspoon kosher salt
• 2 cups chopped skinless, boneless rotisserie chicken breast $
• 1/4 cup minced sweet onion $
• 8 (1 1/2-ounce) slices rye sandwich bread
• 4 red leaf lettuce leaves
• 1 cup microgreens or arugula

Directions