In a mixing bowl, cream together the softened butter and granulated sugar until smooth.
Add the egg and vanilla extract, and mix until well combined.
In a separate bowl, whisk together the all-purpose flour, baking powder, and salt.
Gradually add the dry ingredients to the wet ingredients, mixing until a dough forms.
Gently fold in the diced strawberries.
Divide the dough into equal portions and shape them into round cookies.
Place the cookies on a baking sheet lined with parchment paper.
Refrigerate the cookies for 30 minutes to firm them up.
Meanwhile, preheat your oven to 180°C (350°F).
Bake the chilled cookies for about 12-15 minutes, or until the edges are lightly golden.
Allow the cookies to cool on a wire rack before serving.
