Marinate the chicken breasts in buttermilk for at least 1 hour.
In a bowl, mix flour, garlic powder, paprika, salt, and pepper.
Remove the chicken from the buttermilk, letting excess drip off.
Dredge each piece of chicken in the flour mixture until fully coated.
Heat vegetable oil in a frying pan over medium-high heat.
Fry the chicken for about 6-7 minutes on each side until golden brown.
Remove and drain on paper towels to absorb excess oil.
Toast the burger buns lightly in the same pan.
Spread mayonnaise on the bottom half of each bun.
Place the crispy chicken on top, add pickles, and close the sandwich.