Prepare all the ingredients by slicing the onion and ham/bacon, and chopping the green onion finely.

Lightly toast the tortillas on both sides in a dry pan without oil.

Melt butter in a pan over medium heat.

Whisk one egg in a bowl and pour it into the pan. Add sliced onion, ham/bacon, and chopped green onion on top. Sprinkle with salt, pepper, and sugar.

Place a slice of cheese on top of the mixture.

Cover the mixture with a toasted tortilla.

Flip the tortilla over carefully and cook for another minute.

Roll the tortilla tightly while it is still warm.

Slice the rolled tortilla into bite-sized pieces.