Squeeze the carrots in a towel or blot on paper towels to remove excess moisture. Line a microwave tray with a piece of parchment paper and spread the carrots on it in a thin, even layer. Microwave on low power for about 40 minutes, or until the carrots are completely dried out. Let cool to room temperature.
Grind the carrots to a powder in a coffee or spice grinder. Store in a covered