Slice the chicken breast into even-sized strips or thin cutlets to ensure even cooking.
In a shallow bowl, whisk together the buttermilk and Dijon mustard, then submerge the chicken and let marinate for 10 minutes.
In a separate small bowl, combine the arrowroot powder, almond flour, sea salt, black pepper, garlic powder, and paprika.
Remove each piece of chicken from the buttermilk, letting the excess drip off, and dredge thoroughly in the flour mixture until well-coated.
Heat the avocado oil in a non-stick skillet over medium-high heat until shimmering.
Place the chicken in the skillet and cook for 4-5 minutes per side until the coating is golden brown and the internal temperature reaches 165 degrees Fahrenheit.
Remove the chicken from the pan and set aside to rest.
To make the gravy, lower the heat to medium and add the almond milk to the remaining pan drippings, whisking constantly to incorporate any browned bits.
Simmer the sauce for 2 minutes until it thickens into a creamy consistency, then pour over the crispy chicken and serve immediately.