This is a test of commonsense. Complete the next sentence:

How to make a mushroom omelette
Wash the mushrooms and cut them into thin slices.
You can leave the stems on, or discard them. Be sure to scrub the mushrooms with a soft-bristled brush to remove any dirt.
You don't need to peel them. Heat 1 teaspoon (5 grams) of unsalted butter in a medium-sized frying pan over medium heat.