How do you know when the oven is done preheating?

Online Answer
Hang an oven thermometer in the center of the middle rack and preheat the oven to 350˚F (176.67˚C). This will tell you if the oven is even reaching the desired temperature from the beginning.
Related Questions 📌
Because steam assist ovens speed up cook times and internally regulate food temperatures, they also use less energy than traditional electric and gas ovens.
Set your steam oven to 95°F/35°C (or, if you can, lower – 82°F/28°C is perfect). Use the dough proving setting if you have one, or the steam setting if you don't. Put the bowl into the oven until the dough has doubled in size, about 30 minutes..
Sometimes a potato could be even moister and the water, especially in a larger size potato may be trying to escape as steam from the middle cells of the potato. It hits the outer cells, already expanding from heat and bursts open..
The first step to breading chicken is crucial.
The best way to clean up glass any surface including inside of an oven is to use some very soft bread. Use it like you would use a sponge essentially. The softness of the bread will cling to anything else it's a class and it will create a safe environment to cook in again (for the most part)..