Set an oven rack about 6 inches from the heat source and preheat the oven's broiler. Brush an oven-safe skillet with vegetable oil.

Whisk miso paste, rice wine vinegar, maple syrup, and hot chili sauce together in a bowl.

Arrange salmon fillets, skin-sides down, in the prepared skillet. Place skillet over medium heat; cook until skin starts to sizzle, 2 to 3 minutes. Remove skillet from heat.

Brush salmon fillets with miso glaze. Place skillet in the preheated broiler; cook until salmon is just cooked through and top is browned, about 8 minutes.

Remove fillets from skillet, separating flesh from skins; leave skins in the pan.