01 - Preheat oven to 350°F and grease a nonstick donut pan thoroughly.
02 - Whisk together sweet rice flour, granulated sugar, cocoa powder, baking powder, and salt in a large bowl until uniformly combined.
03 - In a separate bowl, whisk eggs, milk, vegetable oil, peppermint extract, and vanilla extract until fully incorporated and smooth.
04 - Pour wet mixture into dry ingredients and stir until batter is smooth and free of lumps.
05 - Spoon or pipe batter into prepared donut pan, filling each cavity approximately three-quarters full.
06 - Bake for 15-18 minutes until donuts spring back when lightly touched. Cool in pan for 5 minutes, then transfer to wire rack to cool completely.
07 - Whisk powdered sugar, cocoa powder, 2 tablespoons milk, and peppermint extract until smooth. Add additional milk as needed to achieve thick but pourable consistency.
08 - Dip each cooled donut into glaze, allowing excess to drip off, then immediately sprinkle with crushed peppermint candies. Allow glaze to set before serving.