Place the chicken breast in a shallow bowl and pour the buttermilk over it, ensuring it is fully coated. Let it marinate for 20 minutes in the refrigerator.
In a small bowl, whisk together the almond flour, arrowroot powder, garlic powder, onion powder, sea salt, and black pepper.
Remove the chicken from the buttermilk, letting excess liquid drip off, then dredge it thoroughly in the flour mixture until evenly coated.
Heat the avocado oil in a non-stick skillet over medium heat. Once hot, add the chicken and cook for 5-7 minutes per side until the exterior is golden brown and the internal temperature reaches 165°F.
While the chicken cooks, whisk together the honey and Dijon mustard in a small ramekin to create the dipping sauce.
Steam the broccoli florets for 4-5 minutes until tender-bright green.
Serve the crispy chicken alongside the steamed broccoli with the honey mustard sauce on the side.