1
Adjust rack to middle position (top and middle positions for 4 servings) and preheat oven to 425 degrees. Place 2 TBSP butter (3 TBSP for 4) in a small bowl and bring to room temperature.
Pat chicken* dry with paper towels and season all over with salt and pepper; place on one side of a baking sheet (spread out across entire sheet for 4).
Brush tops of chicken with ½ TBSP dressing each (save the rest for serving). Sprinkle with Monterey Jack. Crush crispy onions in their package, then sprinkle over cheese, pressing to adhere.
Roast on middle rack for 5 minutes (you’ll add more to the sheet then).