If you have an immersion blender: Add all ingredients to your immersion blender cup or a cup/jar that is a little bit larger than your blender stick. Put blender on the bottom of the cup and start blending on low. Once you start to see things thickening, you can start to make a slight up-and-down movement. I like to stop every so often and kind of stir things around with the stick while the blender isn't running. But you should be able to get something that resembles mayonnaise texture in just two or three minutes of blending. Once done you can skip to the last two steps.

If you do not have a blender, get ready to whisk: Grab a medium mixing bowl and a whisk.

Whisk the yolks, mustard, and bacon fat until it all is a bit frothy. Slowly trickle oil into the bowl while whisking. Add more oil very slowly whisking the whole time. You will start to see things getting a bit thicker and at that point, you can add more oil.

Once things start to look more like a yogurt texture you can increase the flow of oil. But you still want to continue vigorously whisking. If you ever start to get a texture where your mayo looks like it's curdling, you need to stop adding oil until your texture binds back together.

You can stop whisking when you've used all your oil, and the texture of your mayo is smooth. 

Add the chopped bacon pieces and stir to combine them into the creamy mayonnaise. 

Put the bacon-infused mayonnaise into a jar or sealed container and store it in the fridge for no more than two weeks.