01 -
Heat your oven to 350°F and generously butter a 6-cavity donut pan. Set up a piping bag with a large round tip - this will make filling the molds so much easier than spooning.
02 -
Melt the butter in a microwave-safe bowl for about 20-30 seconds. Whisk in the sugar, milk, egg, and vanilla until everything comes together smoothly.
03 -
Sift the flour directly into your wet mixture, then add the baking powder and salt. Gently fold everything together with a rubber spatula, but don't overmix - stop when it's about halfway combined.
04 -
Add those beautiful blueberries and continue folding gently until they're evenly distributed and no dry flour patches remain. The batter should be thick but pipeable.
05 -
Transfer the batter to your piping bag and pipe one complete circle into each donut cavity. Divide any remaining batter evenly, then smooth the tops with a damp finger. Bake for 13-15 minutes until the tops spring back when lightly touched.
06 -
Let the donuts cool in the pan for 10 minutes, then gently turn them out onto a wire rack. They need to be completely cool before glazing or the glaze will just melt off.
07 -
Warm the 2 tablespoons of blueberries in the microwave for 15-20 seconds, then mash them with a fork. Press the mashed berries through a fine strainer to extract the juice - you'll need about 2-3 teaspoons of pure blueberry juice.
08 -
Whisk the powdered sugar and vanilla together, then gradually add the blueberry juice half a teaspoon at a time until you get a thick but pourable consistency. Spoon the gorgeous purple glaze over each donut and let it set for at least 20 minutes before serving.