Making roasted cumin powder is very easy. Just roast a handful of cumin seeds on low heat in a pan. Keep stirring and tossing for even browning and brown until you start getting a nice aroma and dark brown color. Then turn off the heat, let it cool down a bit, and then grind it into a powder using a spice grinder or a nutri-bullet blender. Store roasted cumin seeds in a clean, dry jar for later use.