01 - Preheat the oven to 350°F. Grease a mini donut pan thoroughly with cooking spray or butter.
02 - In a large mixing bowl, whisk together sweet rice flour, ground black sesame seeds, granulated sugar, baking powder, and salt until evenly distributed.
03 - In a separate bowl, beat eggs until lightly frothy. Add milk, melted butter, and vanilla extract. Whisk until fully combined and smooth.
04 - Pour the wet ingredients into the dry ingredients. Mix with a spatula or whisk until a smooth, thick batter forms, ensuring no dry flour remains.
05 - Spoon or pipe the batter into the prepared donut pan, filling each cavity approximately 3/4 full to allow for rising.
06 - Bake for 15-18 minutes, or until the donuts spring back when lightly pressed and a toothpick inserted into the center comes out clean.
07 - Let the donuts cool in the pan for 5 minutes to set, then carefully transfer to a wire rack to cool completely before glazing.
08 - In a small bowl, whisk powdered sugar with 1 tbsp milk and black sesame paste until smooth. Add additional milk, 1 tsp at a time, if needed to achieve a dipping consistency.
09 - Dip the top of each cooled donut into the glaze, allowing excess to drip off. Sprinkle with additional black sesame seeds if desired. Let glaze set for 10-15 minutes before serving.