01 - Preheat oven to 350°F. Lightly grease a donut pan with cooking spray or butter.
02 - Heat milk in a small saucepan until just steaming. Remove from heat, add Earl Grey tea bags, and steep for 10 minutes. Squeeze out tea bags and discard. Let infused milk cool to room temperature.
03 - In a large bowl, whisk together mochiko, granulated sugar, baking powder, and salt until well blended.
04 - In a separate bowl, whisk melted butter, eggs, infused Earl Grey milk, and vanilla extract until smooth and fully incorporated.
05 - Pour wet ingredients into dry ingredients. Stir gently until just combined and smooth, being careful not to overmix.
06 - Spoon or pipe batter into prepared donut pan cavities, filling each about three-quarters full.
07 - Bake for 15-18 minutes until donuts are puffed and lightly golden. A toothpick inserted into the center should come out clean.
08 - Let donuts rest in pan for 5 minutes, then carefully transfer to a wire rack to cool completely.
09 - Whisk together powdered sugar, brewed Earl Grey tea, milk, and vanilla extract until smooth and pourable. Add additional milk teaspoon by teaspoon if glaze is too thick.
10 - Dip tops of cooled donuts into glaze, allowing excess to drip off. Return to wire rack and let glaze set for 15 minutes before serving.