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 the sweet rice flour, granulated sugar, cocoa powder, baking powder, and salt until evenly distributed.
03 - In a separate bowl, whisk the eggs, milk, vegetable oil, peppermint extract, and vanilla extract until fully combined and smooth.
04 - Pour the wet ingredients into the dry ingredients. Mix vigorously until a smooth, thick batter forms without any lumps.
05 - Spoon or pipe the batter into the prepared donut pan, filling each cavity about three-quarters full.
06 - Bake for 15 to 18 minutes, or until the donuts spring back when lightly touched in the center.
07 - Let the donuts cool in the pan for 5 minutes, then carefully transfer to a wire rack to cool completely before glazing.
08 - Whisk together the powdered sugar, cocoa powder, 2 tablespoons milk, and peppermint extract until smooth. Add additional milk 1 teaspoon at a time if needed to achieve a thick but pourable consistency.
09 - Dip the top of each cooled donut into the glaze, letting excess drip off. Immediately sprinkle with crushed peppermint candies. Let the glaze set for about 15 minutes before serving.