Melt the butter in the same skillet over low heat. Add the eggs and gently stir only a few times as they slowly cook. This should only take a few minutes. Sprinkle with just a bit of salt and pepper. When the eggs begin to hold together, add the mushrooms and onions back to the skillet.
Stir gently to combine and remove from the heat while the eggs are still a bit wet. They will finish cooking in the pan, in the time it takes to serve them. Top the plates with the garlic scapes just before serving. Enjoy!