01 - Preheat oven to 350°F. Grease a nonstick donut pan thoroughly.
02 - Whisk sweet rice flour, granulated sugar, cocoa powder, baking powder, and salt in a large bowl until combined.
03 - Whisk eggs, milk, vegetable oil, peppermint extract, and vanilla extract in a separate bowl until well blended.
04 - Pour wet ingredients into dry ingredients. Stir until smooth batter forms with no lumps.
05 - Spoon or pipe batter into prepared donut pan, filling each cavity about 3/4 full.
06 - Bake for 15-18 minutes until donuts spring back when lightly touched. Cool in pan 5 minutes, then transfer to wire rack.
07 - Whisk powdered sugar, cocoa powder, 2 tablespoons milk, and peppermint extract until smooth. Add additional milk if needed for thick, pourable consistency.
08 - Dip each cooled donut into glaze, allowing excess to drip off. Sprinkle with crushed peppermint candies immediately. Let glaze set before serving.