01 - Preheat oven to 350°F. Lightly grease a donut pan with cooking spray or butter.
02 - Heat milk in a small saucepan until 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, sugar, baking powder, and salt until evenly distributed.
04 - In a separate bowl, whisk melted butter, eggs, infused 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, filling each cavity about three-quarters full.
07 - Bake for 15-18 minutes until donuts are puffed and a toothpick inserted into the center comes out clean.
08 - Let donuts cool in the pan for 5 minutes, then carefully transfer to a wire rack to cool completely before glazing.
09 - In a bowl, whisk together powdered sugar, brewed Earl Grey tea, milk, and vanilla extract until smooth and pourable. Add additional milk 1 teaspoon at a time if glaze is too thick.
10 - Dip the top of each cooled donut into the glaze. Return to wire rack and let glaze set for 15 minutes before serving.