Slice the chicken breast into even strips and season both sides with sea salt, black pepper, garlic powder, onion powder, and paprika.
Place the buttermilk in a shallow bowl and the 2 tablespoons of whole wheat flour in another shallow bowl.
Dip each chicken strip into the buttermilk, allowing excess to drip off, then dredge thoroughly in the flour until evenly coated.
Heat the avocado oil in a large non-stick skillet over medium-high heat.
Add the chicken strips to the hot skillet and cook for 4-5 minutes per side until the coating is golden brown and the chicken is cooked through.
Remove the chicken from the skillet and set aside on a plate, keeping the remaining oil and browned bits in the pan.
Reduce the heat to medium and whisk the remaining 1 tablespoon of flour into the pan drippings for 1 minute.
Slowly whisk in the low-fat milk, stirring constantly until the gravy thickens and becomes smooth.
Serve the crispy chicken immediately with the warm gravy drizzled over the top.