You can! I have tested this soup using a Panasonic slimline microwave with the following instructions: 1) Add the vegan butter, garlic and parsley in a bowl and put on the base of the microwave, cooking on high for 1 minute. 3) Add the fresh chestnut mushrooms and cashews to the parsley butter mixture. Cook on medium microwave for 5 minutes. 4) Transfer to a blender and add the vinegar, dried mixed herbs, cooked chestnuts and a generous pinch of salt and pepper. Blend until smooth.