Preheat your oven to 350°F (175°C).
In a medium bowl, whisk together the flour, baking powder, and salt.
In a large bowl, beat the softened butter, cream cheese, granulated sugar, and brown sugar until smooth and creamy.
Add the egg and vanilla, mixing until just combined.
Gradually add the dry mixture to the wet ingredients, mixing gently to combine.
Fold in the diced strawberries and white chocolate chips, if using.
Scoop tablespoon-sized portions of the dough onto a lined baking sheet, spacing them about 2 inches apart.
Bake for 10-12 minutes or until the edges are lightly golden.
Allow the cookies to cool on the baking sheet for 5 minutes before transferring them to a wire rack.