5 Minute Avocado Chicken Lettuce Wraps

4-6 romaine lettuce leaves
1 medium avocado
½ lemon or lime (for juice)
1 cup cooked chicken, shredded or cubed
1 roma tomato (or handful of grape tomatoes)
2 tablespoons chopped onion (red, green, white…whatever you like!)
¼ bell pepper, diced
Salt, pepper and garlic powder to taste