Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Cut the chicken breast into bite-sized nugget pieces, ensuring they are relatively uniform in size for even cooking.
In a small shallow bowl, whisk the egg white until it becomes slightly frothy.
In a separate shallow bowl, whisk together the almond flour, arrowroot powder, garlic powder, smoked paprika, sea salt, and black pepper.
Dip each chicken piece into the egg white to coat, then dredge thoroughly in the almond flour mixture until fully covered.
Arrange the coated nuggets on the prepared baking sheet and lightly drizzle with olive oil to help them crisp up.
Bake for 15 to 18 minutes, turning the nuggets over halfway through, until the coating is golden-brown and the chicken is cooked through.
While the nuggets bake, stir together the Greek yogurt, Dijon mustard, honey, and lemon juice in a small ramekin until smooth.
Serve the crispy nuggets immediately while hot alongside the zesty dipping sauce.