01 - Preheat the oven to 350°F. Grease a mini donut pan thoroughly with cooking spray or butter.
02 - In a large bowl, whisk together sweet rice flour, ground black sesame seeds, granulated sugar, baking powder, and salt until well blended.
03 - In a separate bowl, beat eggs until lightly frothy. Add milk, melted butter, and vanilla extract. Whisk until fully incorporated.
04 - Pour the wet mixture into the dry ingredients. Stir with a spatula or whisk until a smooth, thick batter forms without lumps.
05 - Transfer batter to a piping bag or use a spoon to fill each donut cavity about 3/4 full, taking care not to overfill.
06 - Bake for 15-18 minutes until donuts spring back when touched and a toothpick inserted comes out clean.
07 - Allow donuts to rest in the pan for 5 minutes, then carefully transfer to a wire rack to cool completely before glazing.
08 - Whisk powdered sugar with 1 tbsp milk and black sesame paste until smooth. Adjust consistency with additional milk if needed for dipping.
09 - Dip the tops of cooled donuts into the glaze, letting excess drip off. Sprinkle with additional black sesame seeds if desired. Let glaze set before serving.