Place the chicken breast between two sheets of parchment paper and pound to an even half-inch thickness.
In a shallow bowl, soak the chicken in the buttermilk for at least 10 minutes to tenderize.
In a separate small bowl, whisk together the almond flour, smoked paprika, garlic powder, sea salt, and black pepper.
Remove the chicken from the buttermilk, letting any excess drip off, then dredge thoroughly in the almond flour mixture until fully coated.
Heat the avocado oil in a non-stick skillet over medium heat.
Add the chicken to the skillet and cook for 5-6 minutes per side until the crust is golden brown and the internal temperature reaches 165°F.
While the chicken cooks, lightly toast the sprouted grain bun in a toaster or on a dry pan.
Assemble the sandwich by placing the lettuce, tomato, and pickles on the bottom bun, followed by the crispy chicken and the top bun.