Prepare Dough: In a large mixing bowl, whisk together the gluten-free flour blend, sugar, and baking powder until well combined.

Mix Wet Ingredients: In another bowl, crack the eggs and add the milk, melted butter, and vanilla extract. Whisk together until smooth.

Combine Mixtures: Gradually pour the wet ingredients into the dry mixture and mix gently until a smooth batter forms.

Chill Dough: Cover the bowl with plastic wrap and refrigerate for about 30 minutes.

Shape Donuts: Roll the dough to about ½-inch thickness and cut out donuts using a donut cutter.

Preheat Air Fryer: Preheat your air fryer to 350°F for about 5 minutes.

Cook: Place shaped donuts into the air fryer and cook for 8-10 minutes, flipping halfway through.

Make Pastry Cream: While the donuts are cooking, heat the milk and whisk together cornstarch, sugar, and egg yolks in a separate bowl.

Fill Donuts: Once cooled, use a piping bag to fill each donut with the cooled pastry cream.

Glaze: Melt the chocolate glaze and dip the tops of each filled donut into it, letting the excess drip off.