Preheat waffle iron. Heat oil in a pan over medium heat, then add onion and bell pepper. Saute for a few minutes, then add tomato and continue cooking vegetables until tender and lightly browned. Remove from heat.

Add sugar (if using) to lightly beaten eggs, then pour half of your egg mixture into the waffle iron (or until it is just barely filled, as you would with waffle batter). Sprinkle with sauteed onions, bell peppers, and tomatoes (about half of the vegetables, using more or less as needed). Add half of the cheese, as well as salt and pepper to taste.

Close lid on waffle iron and cook until your light indicates that your omelette is done.

Pop out the omelette and enjoy!