Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a large bowl, cream together the softened butter and sugar until light and fluffy.
Add the egg and vanilla extract, mixing until well combined.
In a separate bowl, whisk together the 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.
Using a cookie scoop, drop dough onto the prepared baking sheet.
Bake for 12-15 minutes or until edges are lightly golden.
Cool on the baking sheet for a few minutes.
Sandwich whipped cream between two cookies and top with a fresh strawberry slice.