Place a medium nonstick pan over medium heat, then arrange inside 4 mason jar lids (centers removed).

Lightly spray with cooking spray. Very gently crack eggs into the centers of the lids and lightly whisk with a fork to break up the yolk. 

Pour water around the lids and cover the pan. Cook on low heat for about 3-4 minutes, or until the egg is just set.

Remove lid and top eggs with cheese if you like. 

Cook until the cheese is slightly melted, about 1 minute more. 

Gently flip the egg "bun" side without the cheese onto the plate. Top with mashed avocado and cooked bacon. 

Assemble as shown, and enjoy!