Add banana, avocado, milk, vanilla extract, lime juice, lime zest, ice and gelatin to blender. If desired, add optional egg yolks and additional supplements/add-ins. Turn blender on, remove cap from the blender lid, and pour in additional liquid/ice as needed. Taste and add honey/maple syrup if desired, then serve.
* If you're not comfortable consuming raw egg yolks it's totally fine to leave them out. Here's an article which discusses the subject in more detail.