Place the chicken breast in a shallow bowl and pour the buttermilk over it, ensuring it is fully submerged for at least 15 minutes to tenderize.
In a separate small dish, whisk together the almond flour, garlic powder, onion powder, sea salt, and black pepper to create the breading.
Remove the chicken from the buttermilk, letting any excess liquid drip off, then dredge it thoroughly in the seasoned almond flour mixture.
Heat the avocado oil in a non-stick skillet over medium heat and sear the chicken for 5-6 minutes per side until the coating is golden brown and the center is cooked through.
While the chicken is searing, steam the broccoli florets in a steamer basket for 4-5 minutes until they are vibrant green and tender-crisp.
In a small ramekin, whisk together the honey and Dijon mustard until the glaze is completely smooth.
Drizzle the honey-mustard glaze over the warm chicken and serve immediately alongside the steamed broccoli.