2 minutes at full power in the microwave (do not cover), stir, again 2 minutes, stir again and again 2 minutes in the microwave.
Spread on a baking sheet and let it cool down.
Be careful when multiplying the amount! I tried it once with 4 times the amount: It then took far more than 4 times longer and the result was not really good! If you need more, prepare it in portions!