Combine cinnamon, ginger, cardamom, allspice, and black pepper. Add additional spices to taste.
Chai Baked Donut Batter
Preheat oven to 350°F. Spray three donut pans with nonstick spray. (See note if you don't have three pans)
Combine flour, baking soda, salt, and 3 Tbsp. chai spice mixture in small bowl. Set aside.
Combine Greek yogurt, heavy cream, and vanilla in small bowl. Set aside.
Add butter, sugar, and molasses to standing mixture. Combine for 2 minutes on high speed.
Add egg. Run mixer for one minute. Add second egg. Let mixture run for one minute.
Reduce speed to low. Add flour mixture. Mix until combined.
Add yogurt mixture. Mix until combined.
Scrape down sides and transfer batter to piping bag fitted with round piping tip. Pipe into prepared donut pans and bake for 10-15 minutes or until donuts bounce back slightly.
Remove pans from oven and let cool on cooling rack for 5 minutes. Remove donuts from pans and let cool completely.
Vanilla Cinnamon Glaze
Add powdered sugar, vanilla, cinnamon, salt, and heavy cream to bowl of standing mixer.
Beat on medium-high until combined. Add additional powdered sugar or cream as needed to obtain desired consistency.
Notes
You can swap 1 cup of sour cream for the heavy cream + Greek yogurt mixture and 1 cup brown sugar for the sugar + molasses mixture. The original King Arthur Flour recipe calls for both but I didn't have either, so I had to improvise!
I had some batter left over, but only two donut pans, so I used another pan to make six maple leaf-shaped cakes!