Pat the chicken thighs dry with paper towels. Season both sides with the salt, paprika, garlic powder and pepper.
Heat the olive oil in a large skillet over medium-high heat until it shimmers.
Add the thighs smooth side down, leaving space between them. Cook without moving for 5–6 minutes, until deep golden brown.
Flip the thighs and reduce the heat to medium. Cook for 5–6 minutes more, until the thickest part reaches at least 165°F.
Add the butter during the last minute and spoon it over the chicken as it melts.
Rest for 5 minutes before serving.