Step 1

To a blender or small food processor, add the egg, mustard powder, and vinegar. Blend for just a few seconds until the egg mixture is lightly beaten.

Step 2

Turn the blender on low, and slowly stream in the oil.

Step 3

Turn up the Blender to high and a thick sauce will form in about 1 minute.

Step 4

Use mayonnaise is a recipe, or transfer to an air tight container and store for up to 7 days in the fridge.