Bring milk to a boil. Place tea bags in milk and let them steep for 10 minutes. Squeeze the milk out of bags and discard tea bags.
If using the oven preheat oven to 350 degrees. Grease doughnut pans.
In a medium bowl, mix flours, potato starch, xanthan gum, sugar, baking powder, and salt.
Add egg, milk, butter or oil and vanilla. Beat with an electric mixer on low speed just until mixed.
Fill the donut pans ⅔ full. Bake at 350 degrees for 12 – 15 minutes or until tops are brown and an inserted toothpick comes out clean.
Place the donut pans on cooling rack and let the doughnuts cool in the pans.
Once the doughnuts are cool, spoon glaze over them.
Vanilla Glaze:
Add sugar, milk, and vanilla to a small bowl. Mix well to ensure sugar is completely dissolved. Place wax paper or baking sheet beneath cooling rack. Spoon glaze over doughnuts.
Notes
If using a donut maker, fill the bottom portion until it is just full. Close the lid and cook for 7 minutes or until the donuts are brown. Remove the doughnuts and allow them to finish cooling on a cooling rack.