Three-in-one breakfast machine coffee machine can cook milk. According to relevant public information, the coffee machine of the three-in-one breakfast machine has a heating function and a steam nozzle, and a heating pipe is arranged inside, so that milk can be heated to a proper temperature through the heating pipe, and steam is sprayed out through the nozzle to form a strong airflow and pressure, so that milk is vaporized to form milk bubbles. When making milk coffee, you can first pour milk into the milk tank of the coffee machine, then heat the milk to a suitable temperature through the heating function, and finally steam the milk through the steam nozzle to make it into milk bubbles and mix it with coffee.