Lemon Yogurt Chicken Stack

Ingredients

• 1-3/4 cups plain Greek yogurt, divided
• 1/3 cup refrigerated lemonade
• 2 Tbsp. chopped fresh mint
• 1 tsp. salt, divided
• 4 boneless, skinless chicken breasts, fresh or thawed if frozen
• 1/3 cup finely shredded cucumber
• 1/2 tsp. garlic powder
• 1/4 tsp. black pepper
• 3 Tbsp. butter
• 4 refrigerated bagels, split apart
• 4 leaves lettuce
• 4 slices tomato