Oven button with a "high" or "low" setting

BROIL

Think of the cooking method that uses direct heat from above, often used to brown or crisp the top of a dish quickly.

This clue refers to the oven function that cooks food with direct heat from above, often used for browning or crisping dishes. The "high" or "low" setting hints at the intensity of the heat, which is a common feature for this cooking mode. The answer is "BROIL," the term for this oven function in American English (called "grill" in British English).