Thai Toasted-Rice Powder

Place rice in a 12-inch stainless steel skillet and shake pan to distribute grains into an even layer. Cook over medium heat, shaking skillet frequently to redistribute rice into an even layer, until rice is lightly golden, about 10 minutes. If rice begins to scorch, lower heat to medium-low.
Continue to cook, shaking skillet frequently, until rice is deep golden brown, 15 to 20 minutes longer. Remove from heat, transfer rice to a rimmed baking sheet, and let cool to room temperature, 5 to 8 minutes.
Transfer toasted rice to a spice grinder or the bowl of a mortar and pestle. Grind to a coarse powder with a texture similar to that of ground coffee used for pourover brewing. Allow rice powder to cool to room temperature, then store in a dry, airtight container.