Chicken Salad on Grilled Romaine Lettuce - Foodness Gracious

Ingredients

• 1/3 cup mayonnaise
• 2 tablespoons Dijon mustard
• Juice from 1/2 medium sized lemon
• 2 x 7oz containers of Greek yogurt
• Sea Salt and black pepper
• 2 medium sized chicken breasts
• 3 tablespoon olive oil divided
• Salt and black pepper
• 1 head of Romaine lettuce
• 1 cup grapes cut in half
• 3/4 cup chopped walnuts
• 1 cup cooked bacon chopped
• 1 cup sliced radish
• 1 1/2 cups chopped celery
• 3/4 cup chopped green onions
• 1 slices large avocado cut into