Fry the mushrooms in butter or olive oil. Season with pepper and salt.
Poach the eggs. To do this, bring water to the boil, add a dash of vinegar and stir with a whisk to create a swirl. Now pour the egg into the swirl so that the egg white wraps around the yolk. Depending on how hard you want the egg, let it boil gently for a few minutes. We like soft poached eggs, so we remove it from the water after about 2.5 minuuut.
Put the eggs on top of the avocado. Season with salt and pepper and add a dash of sriracha sauce.