Preheat a grill or grill pan on medium heat.
Season both sides of the chicken well with salt and pepper. Grill the chicken on both sides to an internal temperature of 160°F using a thermometer, approximately 3 to 4 minutes per side. Remove from the heat and set aside to rest for 3 minutes before dicing into bite sized pieces.
Place the eggs in a pot and cover with cold water. Bring the eggs to a boil on the stovetop. Once the water starts to boil set a timer for 6 minutes. Remove from the heat, drain the water, and run the eggs under cold water for 2 to 3 minutes to cool. Then peel and chop.
In a nonstick pan on medium heat, cook the chopped bacon until crispy. Remove with a slotted spoon to drain the fat.
Lay down the lettuce, top with chicken, bacon, hard boiled eggs, avocado, cucumber, radish, tomato, onion, and blue cheese.
In a bowl whisk together the dijon mustard, garlic, lemon, and oil. Season with salt and pepper.
Dress the salad and serve.