Whisk the eggs with the cream / milk. Crumble and season the feta cheese. Lightly grease a cup or a small casserole dish and add the egg mixture (do not fill the cup more than three quarters as the egg mixture will rise)
Let it set in the oven at 180 degrees (160 degrees circulating air) for approx. 10-15 minutes. Sprinkle with chives and serve.
A delicious variant for the breakfast table that also looks nice.