Preheat your oven to 350°F (175°C) and grease your donut pan.

In a large bowl, mix together the dry ingredients: flour, sugar, baking powder, baking soda, and salt.

In another bowl, whisk the wet ingredients: egg, milk, melted butter, vanilla extract, and pureed strawberries.

Combine the wet and dry mixtures, folding gently until just combined.

Fill each cavity of the donut pan about ¾ full with batter.

Bake for 10-12 minutes until they spring back lightly.

Let the donuts cool in the pan for 5 minutes, then invert onto a wire rack.

Prepare the glaze by whisking powdered sugar and milk until smooth.

Dip the cooled donuts into the glaze and place back on the rack to set.

Top with fresh strawberries if desired.