01 - Preheat the oven to 350°F. Lightly grease a nonstick donut pan with cooking spray or oil.
02 - In a large mixing bowl, whisk together sweet rice flour, granulated sugar, cocoa powder, baking powder, and salt until thoroughly blended.
03 - In a separate bowl, whisk eggs, whole milk, vegetable oil, peppermint extract, and vanilla extract until smooth and fully incorporated.
04 - Pour the wet mixture into the dry ingredients. Stir vigorously until a thick, smooth batter forms without lumps.
05 - Transfer batter to a piping bag or use a spoon to distribute evenly among donut pan cavities, filling each about three-quarters full.
06 - Bake for 15-18 minutes until donuts spring back when gently touched. Cool in pan for 5 minutes before transferring to a wire rack.
07 - Whisk powdered sugar, cocoa powder, 2 tablespoons milk, and peppermint extract until smooth. Add additional milk 1 teaspoon at a time until reaching thick, pourable consistency.
08 - Dip the top of each cooled donut into the glaze, allowing excess to drip off. Immediately sprinkle with crushed peppermint candies while glaze is wet. Let set for 10 minutes before serving.