Toast the bread. In a bowl, mash the avocado with a fork until smooth. Mix in the cilantro and lemon juice to taste, and season with salt and pepper to taste. Spread the avocado onto the bread slices.
Preheat a non-stick pan over medium-low heat. Once hot, add the oil to the pan. Crack eggs on a flat surface and into the pan, being careful not to break the yolk. Cook until the whites of the eggs are firm and no longer runny. Add 1 to 2 TBSP of water and cover with a lid if desired to help firm the egg whites completely. Season with salt and pepper.
Add the ingredients for the smoothie into a blender. Blend until smooth.
Serve the eggs over the avocado toast with smoothie.