Place chicken breast strips in a bowl with buttermilk and marinate for 20 minutes in the refrigerator.
In a shallow dish, whisk together 2 tablespoons whole wheat flour, garlic powder, onion powder, paprika, sea salt, and black pepper.
Remove chicken from buttermilk, letting excess drip off, then dredge each piece thoroughly in the flour mixture.
Heat avocado oil in a large skillet over medium-high heat until shimmering.
Pan-fry chicken for 4-5 minutes per side until the crust is golden and the internal temperature reaches 165 degrees Fahrenheit.
Remove chicken from the skillet and set aside on a plate.
In the same skillet, melt the grass-fed butter and whisk in 1 teaspoon whole wheat flour to form a smooth roux.
Gradually whisk in the milk and dried thyme, simmering until the gravy thickens while scraping up the flavorful browned bits.
Serve the crispy chicken immediately topped with the warm, creamy gravy.