Place the chicken breast between two sheets of parchment paper and pound to an even half-inch thickness.
Submerge the chicken in buttermilk in a shallow bowl and marinate for at least 30 minutes in the refrigerator.
In a separate shallow dish, whisk together the whole wheat flour, sea salt, black pepper, garlic powder, and paprika.
Remove the chicken from the buttermilk, allowing the excess to drip off, then dredge thoroughly in the flour mixture.
Heat the avocado oil in a cast-iron skillet or heavy pan over medium-high heat until shimmering.
Carefully place the chicken in the pan and sear for 5-6 minutes per side until the coating is golden brown and the internal temperature reaches 165 degrees.
Remove the chicken from the pan and set aside to rest on a wire rack.
In the same pan, whisk the almond milk and arrowroot powder into the remaining drippings over medium heat.
Stir the gravy constantly for 2-3 minutes until it thickens into a velvety consistency.
Plate the chicken and pour the warm gravy over the top before serving.