Preheat oven to 350 degrees F. Spray 8x8 inch baking pan with cooking spray and line with parchment paper.
Steep chai tea bags in boiling water for 20 minutes. Remove tea bags and discard. Let tea cool.
Melt butter in a medium pan over medium heat. Add cinnamon, ginger, cardamom, nutmeg, allspice, and cloves and heat for 1 minute or until aromatic. Remove from heat and let cool slightly.
Combine flour, cocoa powder, salt, and baking powder in a medium bowl.
Combine spiced butter with sugar, whisking until well combined. Add egg, vanilla, and ½ cup brewed chai tea, whisking until combined. Add flour mixture, stirring just until combined. Fold in chocolate chips and pour batter into prepared cake pan.
Bake for 20 minutes. Remove from heat and let cool for 1 hour. Slice and serve.
Notes
You can prepare the steeped tea and chai spiced butter the day before.