Preheat your oven to 350°F (175°C).
In a mixing bowl, cream together the softened butter and sugar until light and fluffy.
Beat in the egg and vanilla extract until well combined.
Add the pureed strawberries to the mixture and mix well.
In a separate bowl, whisk together the flour, baking powder, and salt.
Gradually add the dry ingredients to the wet mixture, stirring until just combined.
Scoop tablespoon-sized portions of dough onto a baking sheet lined with parchment paper.
Gently press a slice of fresh strawberry into the center of each cookie.
Bake in the preheated oven for 12-15 minutes or until edges are lightly golden.
Remove from the oven and let cool on a wire rack.