Place all the ingredients except the herbs in the bottom of a tall measuring cup (that can at least hold 2 cups and has high sides) or wide-mouth mason jar. I like to put the egg and all the other ingredients in first, then add the oil last.Let the ingredients settle at the bottom of your jar. Stick the immersion blender all the way to the bottom of the jar, then let ‘er rip! Move the blender around in the bottom of the cup to get some more air in there. You can also move the blender up and down slightly to do this, but don’t pull it out of the mayo unless you want to make a huge mess in your kitchen. It should become completely emulsified and ranch dressing-like in about 30 seconds!Add in herbs on top of the mayo, then pulse, moving the immersion blender up and down until all the ingredients are completely mixed. Season to taste with additional salt and pepper.The ranch will thicken up a bit in the refrigerator, and will last for about a week.