01 - Preheat oven to 375°F. Grease a 12-cavity donut pan generously and set aside.
02 - In a large mixing bowl, whisk together the all-purpose flour, granulated sugar, baking powder, and salt until evenly distributed.
03 - In a separate bowl, whisk together the whole milk, eggs, melted butter, and vanilla extract until smooth.
04 - Pour the wet ingredients into the dry ingredients and stir gently until just combined. Be careful not to overmix, as this can make the donuts dense.
05 - Transfer the batter into a piping bag or a zip-top bag with one corner snipped off. Pipe the batter evenly into each cavity of the prepared donut pan, filling each about three-quarters full.
06 - Bake for 10 to 12 minutes, or until the donuts are golden and a toothpick inserted into the center comes out clean. Let cool in the pan for 5 minutes, then transfer to a cooling rack to cool completely.
07 - In a mixing bowl, beat the room-temperature butter with an electric mixer until creamy and pale. Gradually add the sifted powdered sugar, beating on low until incorporated, then increase to medium-high until smooth.
08 - Add the strawberry purée, vanilla extract, and a pinch of salt to the buttercream. Beat on medium-high until light and fluffy. Adjust consistency with additional powdered sugar for thickness or a splash of milk to thin.
09 - Once the donuts are completely cool, spread or pipe the strawberry buttercream generously over each donut.
10 - Top each frosted donut with freeze-dried strawberry pieces or sprinkles as desired. Serve immediately or store in an airtight container.