The cooking time for mixed grain porridge in an electric pressure cooker typically ranges from 20 to 30 minutes. This duration is sufficient for the grains to absorb the liquid and become tender. The exact time can vary depending on the specific electric pressure cooker model, the type and ratio of grains used, and the desired consistency of the porridge.

The reason for this relatively short cooking time lies in the design of electric pressure cookers. These appliances use pressure to increase the boiling point of water, which in turn speeds up the cooking process. The high pressure and temperature combination helps to soften the grains more quickly than traditional cooking methods like boiling or simmering. For instance, a study by the Journal of Food Science and Technology found that pressure cooking can reduce the cooking time for grains by up to 70% compared to conventional methods.

In addition to the pressure cooking mechanism, the electric pressure cooker's precise temperature control also contributes to the efficient cooking of mixed grain porridge. The appliance maintains a consistent temperature, ensuring that the grains are cooked evenly without overcooking or burning. This controlled environment is crucial for achieving the perfect texture and flavor in the porridge.

Moreover, the convenience of electric pressure cookers cannot be overlooked. They save time and effort, allowing busy individuals or those with limited cooking skills to prepare a nutritious and delicious meal with ease. The ability to cook mixed grain porridge in a short amount of time makes it a popular choice for health-conscious consumers looking to incorporate a variety of grains into their diet.

In conclusion, the cooking time for mixed grain porridge in an electric pressure cooker is approximately 20 to 30 minutes, thanks to the appliance's pressure cooking technology and precise temperature control. This method not only shortens the cooking time but also ensures a consistent and flavorful result.