Preheat oven to 400°F. Season turkey breast lightly with salt and pepper. Roast on a lined baking tray for approximately 35 minutes or until the internal temperature reaches 145°F.
For eggs, simmer gently in water for 10 minutes. Cool under running water, peel, and slice.
Toss cooked potatoes with the herby lemony mayo.
Slice cooked turkey, tomatoes, and avocado.
Arrange lettuce on a platter, then top with turkey, eggs, tomatoes, avocado, and bacon. Drizzle with grainy mustard dressing.