To determine if your food is done in a toaster oven, you can use a food thermometer to check the internal temperature. Each type of food has specific temperature guidelines for doneness. For example, chicken should reach an internal temperature of 165u00b0F (74u00b0C), while cookies should be golden brown and firm around the edges. Additionally, most toaster ovens come with a visual indicator, such as a bell or an LED light, to signal when the cooking time is complete.