Start by mixing the flour, salt, cayenne pepper, garlic powder, and beer in a mixing bowl. Stir until smooth.
Next, heat the oil in a large skillet, and bring it to about 350 degrees.
Dip the chicken breast, one at a time, into the batter, and lift it out and let the batter drain, then gently place into the oil. Repeat with a couple of more chicken breasts to fit into the skillet.
Once cooked, about 6 minutes, remove and place on a wired baking sheet to let any remaining oil drain off.
To build the sandwich, and this is my preference, add a slice of cheese to the bottom bun, then add the beer battered chicken, top with salad greens, and on the top bun slather with mayonnaise and top with pickles. Top and dig in.