There's no one answer to this question as different chefs prefer different toaster ovens for different reasons. However, some of the most popular toaster ovens used by chefs include the Breville BOV845BSS Smart Oven Pro, Cuisinart TOA-60 AirFryer Toaster Oven and the KitchenAid KCO275SS Convection Toaster Oven.
Each of these toaster ovens has its own unique features that make it ideal for use in a professional kitchen. For example, the Breville BOV845BSS has an interior light so you can easily check on your food, while the Cuisinart TOA-60 comes with a built-in air fryer function for perfectly crispy results. Meanwhile, the KitchenAid KCO275SS boasts 10 pre-set cooking functions, making it super easy to get consistent results whether you're baking, roasting or broiling.
So if you're wondering what toaster oven do chefs use, now you know that there's no one definitive answer. It really depends on the chef's individual preferences and what they need from their toaster oven in order to create delicious meals.