Preheat your air fryer to 400°F.
In a shallow dish, combine the almond flour and a pinch of salt, pepper, and your favorite dried herbs.
Dip the chicken breast into the egg white, ensuring it’s evenly coated, then dredge it in the almond flour mixture to create a light, crispy coating.
Place the coated chicken breast in the air fryer basket and cook for 12-15 minutes, flipping halfway through, until the exterior is crispy and the internal temperature reaches 165°F.
While the chicken cooks, prepare the Greek yogurt sauce by mixing the nonfat Greek yogurt with a squeeze of lemon juice, salt, and pepper.
Toast the whole wheat bun lightly in a pan or air fryer for 1-2 minutes.
Assemble the sandwich by spreading the yogurt sauce on the bun, layering the crispy chicken breast, fresh mixed greens, tomato slices, and topping with an avocado slice.
Serve immediately and enjoy your healthy, delicious sandwich.