Short sound when toggling a light indicator
The click is likely a bimetalic strip that turns on or off the oven heater. The light is also attached to the same heater circuit so gets switched on or off. Devices in this decade still have them as they are the cheapest way to control high wattage heaters. The "led" is likely only a neon bulb, or if indeed a led, it is often connected with just a current limiting resistor.