Slice the chicken breast into even 1-inch thick strips to ensure quick and uniform cooking.
Place the chicken in a bowl with the buttermilk and let it marinate for at least 15 minutes to tenderize the meat.
In a shallow dish, whisk together the whole wheat flour, cornstarch, sea salt, black pepper, paprika, and garlic powder.
Remove each chicken strip from the buttermilk, letting excess drip off, then dredge thoroughly in the flour mixture until well coated.
Heat the avocado oil in a large non-stick skillet over medium-high heat until shimmering.
Carefully place the chicken in the skillet and cook for 4 to 5 minutes per side until the coating is golden brown and crispy.
While the chicken cooks, steam the broccoli florets in a steamer basket for 5 minutes until tender-crisp.
Serve the crispy chicken immediately alongside the steamed broccoli for a balanced, clean-eating meal.