Slice chicken breast into even 1-inch thick strips to ensure uniform cooking.
Place chicken strips in a shallow bowl and pour buttermilk over them, letting them marinate for 20 minutes.
In a separate wide dish, whisk together almond flour, arrowroot powder, garlic powder, onion powder, smoked paprika, sea salt, and black pepper.
Remove each chicken strip from the buttermilk, letting excess drip off, then dredge thoroughly in the flour mixture.
Heat avocado oil in a large non-stick skillet over medium heat until shimmering.
Carefully place chicken in the skillet and cook for 4-5 minutes per side until the coating is golden brown and the internal temperature reaches 165°F.
In a small ramekin, whisk together the dijon mustard, raw honey, and apple cider vinegar until smooth.
Serve the hot chicken strips immediately with the honey-mustard sauce on the side for dipping.