01 - Preheat 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 fully incorporated.
03 - In a separate bowl, whisk eggs, milk, vegetable oil, peppermint extract, and vanilla extract until mixture is uniform and slightly frothy.
04 - Pour wet ingredients into dry ingredients. Mix vigorously with a whisk or spatula until batter is smooth and free of lumps. The batter will be thicker than traditional donut batter.
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 to 18 minutes until donuts spring back when lightly touched in the center. Allow to cool in pan for 5 minutes before transferring to wire rack.
07 - Whisk powdered sugar, cocoa powder, 2 tablespoons milk, and peppermint extract in a medium bowl until smooth. Add remaining milk 1 teaspoon at a time to achieve thick, pourable consistency.
08 - Dip top of each cooled donut into glaze, allowing excess to drip off. Immediately sprinkle with crushed peppermint candies while glaze is still wet. Let stand 15 minutes for glaze to set before serving.