Heart Healthy Chicken Avocado Sandwich | Easy, No Mayo

Ingredients

• 2 light whole grain rolls, split
• 4 leaves Romaine lettuce
• 1/2 tomato, sliced
• 2 slices red onion
• 2 cooked boneless, skinless chicken breasts (3 oz each)
• 1/8 tsp salt
• 1/8 tsp black pepper
• 1/2 ripe avocado, pitted, peeled and mashed