Place the chicken breast between two sheets of parchment paper and pound to an even thickness.
In a shallow bowl, soak the chicken in buttermilk for at least 15 minutes to tenderize.
In a separate shallow dish, whisk together the almond flour, arrowroot powder, garlic powder, onion powder, smoked paprika, sea salt, and black pepper.
Remove the chicken from the buttermilk, allowing any excess to drip off, then dredge thoroughly in the flour mixture until well-coated.
Heat the avocado oil in a large skillet over medium heat until shimmering.
Carefully place the chicken in the skillet and cook for 5-6 minutes per side until the crust is crunchy and the internal temperature reaches 165°F.
While the chicken is cooking, whisk together the Dijon mustard and raw honey in a small bowl until smooth.
Plate the fresh baby spinach and top with the hot chicken breast, then finish with a drizzle of the honey mustard sauce.