Add vegetable scraps, bay leaves and thyme to a large stock pot. Cover with water and bring to a boil. Reduce heat to a simmer and cook for 1 hour.
Strain broth into a separate pot or bowl and stir in Chaga tea crystals. Cool to room temperature or serve hot over noodles. Store stock in an airtight container in the refrigerator or freeze for up to 6 months.