Preheat oven to 375° Fahrenheit. Adjust oven racks to center of oven if needed.
Place 4 medium bone-in, skin-on chicken thighs on cutting board. Pat chicken thighs completely dry on all sides with paper towels.
Season chicken thighs generously on all sides with plenty of sea salt and freshly cracked black pepper. Set aside.
Place large skillet on stovetop over medium-high heat. Add 2 teaspoons neutral oil to skillet and heat pan until oil is hot and shimmery, swirling and tilting pan as needed to distribute oil across surface.
When oil is hot, place seasoned chicken thighs skin-side down in skillet. Sear chicken thighs, undisturbed, 7 to 8 minutes or until skin of chicken thighs is golden-brown.
Flip chicken thighs over. If skins stick to skillet, cook chicken thighs 1 to 2 minutes more, then try again. Continue searing chicken thighs until skins easily release from bottom of skillet.
After flipping chicken thighs, immediately place skillet in preheated oven. Roast chicken thighs 15 minutes or until internal meat thermometer inserted into thickest area of thighs registers 170° Fahrenheit.
When target temperature is reached, carefully remove skillet from oven. Transfer chicken thighs to serving plates and set aside to rest 5 minutes.
After 5 minutes, add preferred sides and serve chicken thighs as desired.