Preheat the oven to 350°F (175°C).
In a medium bowl, whisk together the flour, baking powder, and salt.
In a large mixing bowl, cream together the softened butter, cream cheese, and sugar until light and fluffy.
Add the egg and vanilla extract to the butter mixture, mixing until well combined.
Gradually add the dry ingredient mixture to the wet ingredients, mixing until just combined.
Fold in the diced strawberries gently to avoid breaking them.
Scoop spoonfuls of dough onto a lined baking sheet, spacing them about 2 inches apart.
Bake in the preheated oven for 10-12 minutes or until the edges are lightly golden.
Let the cookies cool on the baking sheet for a few minutes before transferring to a wire rack to cool completely.