Preheat the oven to 450°F and line a baking sheet with parchment paper or foil, then spray with avocado oil.
Mix the mayonnaise, sour cream, and hot pepper sauce in a small bowl to make the chipotle dipping sauce, and set aside.
Cut the chicken breasts into nugget-sized pieces.
In one bowl, whisk the egg with salt, pepper, garlic powder, and cayenne pepper. Place almond flour in another bowl.
Dip each chicken piece in the egg mixture, then coat with almond flour, using one hand for the egg and the other for the flour.
Arrange the coated chicken pieces on the baking sheet, spray with avocado oil, and bake for 8 minutes. Flip the nuggets, spray again, and bake for another 8 minutes until cooked through. For extra crispiness, broil for 2-3 minutes, then serve with the chipotle dipping sauce.