Place the chicken breast between two sheets of parchment paper and pound to an even 1/2-inch thickness.
Submerge the chicken in buttermilk in a shallow bowl and let it marinate for at least 15 minutes.
In a separate shallow dish, whisk together the whole wheat flour, cornmeal, sea salt, black pepper, garlic powder, and smoked paprika.
Remove the chicken from the buttermilk, letting excess drip off, then dredge thoroughly in the flour mixture until well-coated.
Heat the avocado oil in a large skillet over medium-high heat until shimmering.
Carefully place the chicken in the hot skillet and cook for 4-5 minutes per side until the crust is golden brown and the internal temperature reaches 165°F.
While the chicken cooks, steam the green beans for 4 minutes, then add the cherry tomatoes for the final minute to warm through.
Serve the crispy chicken immediately alongside the steamed vegetables for a balanced and hearty feast.