Add the ingredients for the muffin base to a blender. If flavoring the muffins with non-solid ingredients like zest, poppy seeds, or cinnamon, add those ingredients now as well. Blend until completely smooth. Allow batter to sit 5 minutes to thicken up.
Stir in any solid add-ins (such as chocolate chips, blueberries, etc).
Preheat the oven to 350 degrees F and line a muffin tray with muffin papers.
Fill the muffin holes ½ to 2/3 of the way up with the muffin batter. Bake on the center rack of the preheated oven for 20 to 30 minutes, until the muffins are golden-brown and have set up.
Remove muffins from the oven and allow them to cool at least 30 minutes before peeling off the papers and enjoying.