Brush the mushrooms clean and slice them. Heat half of the olive oil in a skillet over medium-high heat and sauté the mushrooms until golden brown, about five to seven minutes. Season with salt and pepper and transfer to a plate.
Pour the remaining oil into the same pan and gently fry the eggs until the white is set but the yolk remains runny. Meanwhile, slice the avocado.
Place the fried eggs next to the mushrooms, arrange the avocado slices alongside and sprinkle everything with coarsely chopped parsley, a pinch of salt and freshly ground pepper. Serve immediately.