Place the chicken breast in a shallow bowl and cover with buttermilk; marinate for at least 15 minutes.
In a separate dish, whisk together almond flour, arrowroot powder, garlic powder, onion powder, salt, and pepper.
Remove chicken from buttermilk, letting excess drip off, then dredge thoroughly in the flour mixture.
Heat avocado oil in a skillet over medium-high heat.
Carefully place chicken in the skillet and cook for 5-6 minutes per side until the exterior is golden and the internal temperature reaches 165°F.
In a small bowl, whisk the honey and Dijon mustard together until smooth.
Steam the broccoli florets until tender.
Drizzle the honey-mustard glaze over the crispy chicken and serve immediately with the broccoli.