Place the chicken breast between two sheets of parchment paper and pound to an even thickness of about half an inch.
In a shallow bowl, soak the chicken in the buttermilk for at least 15 minutes to tenderize the meat.
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 liquid drip off, then dredge thoroughly in the seasoned flour mixture until fully coated.
Heat the avocado oil in a non-stick skillet over medium-high heat until shimmering.
Carefully place the chicken in the skillet and cook for 5-6 minutes per side until the exterior is golden brown and the internal temperature reaches 165 degrees Fahrenheit.
Lightly toast the sprouted grain bun in the same skillet or a toaster until warm.
Assemble the sandwich by placing the butter lettuce on the bottom bun, followed by the crispy chicken and the dill pickles before topping with the remaining bun.