Article in English: If you don't have any cooking spray, you can also simply rub some butter inside the mug. You are using a larger mug because the eggs will expand while being cooked. Keep beating them until the yolks are all broken and mixed in with the whites. There should be no streaks or swirls. Your eggs likely will not be set all the way. This is fine, because you still need to add some toppings and stir them up a bit. Some of the fillings, such as shredded cheese, can be used fresh, but others, such as sausage or bacon, need to be cooked first.  You can use things like diced bacon, chopped scallions, or shredded cheese. You can make the filling just one ingredient, or play around with different combinations. For more ideas on toppings, click here. How long you microwave the eggs for depends on the strength of your microwave. They are ready when they are puffy and all liquid has been absorbed. You can eat it straight out of the mug, or you can eat it on a plate. To get the omelet out, run a knife around the edges of the omelet in the mug, then dump it out onto a plate.

Summary in Indonesian:
Semprot bagian dalam mug tahan panas berkapasitas 350-500 ml dengan minyak. Masukkan telur, garam, dan merica ke dalam mug; kocok menggunakan garpu. Proses telur di dalam microwave selama 1 menit. Tambahkan aneka isian, jika ingin. Aduk cepat telur, proses kembali selama 1-2 menit. Sajikan.