Layer the diced avocado on top of the greens for a pop of green and creamy texture. Arrange the shrimp neatly on top of the greens. Spoon the cocktail sauce left in the bowl over the shrimp and ...

Cover and refrigerate for 30 minutes. Divide the bacon, shrimp mixture, avocado and watercress among 4 bread slices and top with the remaining bread slices.