A Microwave oven-safe bowl isn’t the same as an oven-safe; this is because they both have a different heating process. The oven is more thorough in its heating process than the microwave. A microwave is known to heat food, while an oven can cook food. However, it is possible, to find bowls that are both microwave and oven safe. You can identify these bowls by the inscription on them, usually, at the bottom.