Toast the bread cubes in a pan (with or without oil) until lightly browned and toasted. Remove and set aside.
Heat 1tsp oil in a pan, add the spinach and cook till wilted, about 2~3 minutes. Cool and grind to a paste.
In a mixing bowl, whisk eggs with the spinach paste, salt and pepper. whisk well to combine.
Heat 2tsp butter or oil in a non-stick pan, pour in the egg mixture and cook till the bottom is almost set, about 2~3 minutes.
Sprinkle the cheese and toasted bread cubes on the egg mixture, cover and cook till the eggs are cooked through. Fold the omelette and serve right away!!