Rub salt and pepper over the chicken breast on both sides, let sit for 10 minutes
Toast a handful of peanuts in the oven, chopped and set aside
Combine garlic, scallion, ginger, Thai chili pepper, cilantro, lime juice, soy sauce, sugar and black pepper in a small container, mix well and set aside.
Heat a tablespoon butter in a skillet over medium-low heat until melt, place the chicken breast, skin side down, in the skillet.
Wait 6-7 minutes until the skin side is golden brown (do not move the chicken while cooking), flip the chicken with a spatula.( If the chicken skin sticks to the pan, wait for 1 or 2 more minutes and shake the pan, the chicken should) release.
Pan-fry the other side for 6-7 minutes until golden brown as well.
Add 3 tablespoons butter into the pan, after the butter has melted, tilt the pan toward you, spoon up the butter with a long-handled spoon, quickly and repeatedly spoon up the foamy butter and pour it back over the chicken for 1-2 minutes before the butter starts smoking.
Poke the breasts with a fork, if the juices run clear, the chicken is ready.
Transfer the chicken to a cutting board, let rest a few minutes and then cut into thick slices.
Spoon some lime cilantro sauce onto the chicken and top with chopped peanuts to serve.