Whisk the eggs in a bowl with a fork and season with vegetable stock, pepper and other spices of your choice.
Heat a pan with oil over medium temperature. Chop the tomatoes and mushrooms very small.
Pour eggs into the pan and after 1 minute pour tomatoes and mushrooms on half (!) And sprinkle with a little cheese if necessary. Fry lightly at a low-medium temperature, when the egg is half-set, fold the empty half onto the vegetable half with a spatula.