01 - Preheat oven to 350°F. Thoroughly 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 fully incorporated.
03 - In a separate bowl, whisk eggs, milk, vegetable oil, peppermint extract, and vanilla extract until the mixture is uniform and slightly frothy.
04 - Pour the wet mixture into the dry ingredients. Stir gently until a smooth, thick batter forms without any dry pockets.
05 - Transfer batter to a piping bag or use a spoon to distribute evenly into donut pan cavities, filling each about three-quarters full.
06 - Bake for 15-18 minutes until donuts spring back when lightly touched. Cool in pan for 5 minutes, then carefully remove to wire rack.
07 - Whisk powdered sugar, cocoa powder, 2 tablespoons milk, and peppermint extract until smooth. Add remaining milk as needed to achieve thick, pourable consistency.
08 - Dip the top of each cooled donut into glaze, allowing excess to drip off. Immediately sprinkle with crushed peppermint candies. Let set for 15 minutes before serving.