Preheat the oven to 350°F (175°C).
In a mixing bowl, cream together the softened butter and granulated sugar.
Add the egg and vanilla extract, mixing until well combined.
In a separate bowl, whisk together the sifted flour, baking powder, baking soda, and salt.
Gradually add the dry ingredients to the wet mixture, stirring until just combined.
Fold in the diced strawberries gently.
Drop spoonfuls of dough onto a baking sheet.
Bake in the preheated oven for 12 minutes or until lightly golden.
Allow to cool slightly, then dust with powdered sugar before serving.
