Chicken Milanesa is similar to the American classic chicken fried chicken. Chicken Milanesa Tortas are basically one of the most delicious things ever created because it combines the ultimate chicken fried chicken, seasoned and fried to golden perfection sandwiched in a soft and crunchy bolillo with creamy mayonnaise, tomato slices, rich avocado slices, and lettuce.
Place pounded chicken and buttermilk into a gallon-sized freezer bag and refrigerate for at least 4 hours and up to overnight.
Lightly beat eggs in a shallow bowl with salt.
Combine the panko breadcrumbs, paprika, black pepper, garlic powder, oregano, and cayenne pepper in a small bowl and mix thoroughly with a fork and place mixture in a shallow bowl.
Working one at a time, dredge marinated chicken and transfer to bowl with egg and turn to coat, letting excess drip off. Coat with panko and spices, pressing to adhere.
Heat 1/4 inch of oil in a large skillet over medium heat. Working in 2 batches, cook cutlets until golden brown and cooked through, about 3 to 4 minutes per side.
Transfer the chicken to a paper towel-lined plate to drain.
Repeat with the remaining chicken, adding more oil if needed. If you are not serving them immediately, place chicken in a baking dish, without the paper towels, and keep warm in a 250 degrees F.
Cut bolillos in half lengthwise and spread each side with mayonnaise. Lay the chicken on each roll and top with lettuce, tomatoes, and avocados.