Preheat the Oven: Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.

Make the Cookie Dough: In a large bowl, whisk together the flour, baking soda, and salt. In a separate bowl, beat together the softened butter, granulated sugar, and brown sugar until creamy and light. Add the egg and vanilla extract, and continue mixing until smooth. Gradually add the dry ingredients into the wet ingredients, mixing until a dough forms.

Shape the Cookies: Scoop out dough using a cookie scoop or tablespoon and roll into balls. Place them on the baking sheet, spacing them about 2 inches apart. Flatten each cookie slightly with the back of a spoon or your hand.

Bake the Cookies: Bake the cookies for 8-10 minutes, or until the edges are golden. Remove from the oven and let them cool on the baking sheet for a few minutes before transferring to a wire rack.

Make the Cheesecake Filling: In a medium bowl, beat together the softened cream cheese, powdered sugar, and vanilla extract until smooth and creamy.

Assemble the Cookies: Once the cookies have cooled, top each one with a generous spoonful of cheesecake filling. In a small bowl, mix the chopped strawberries with the granulated sugar and let sit for a few minutes. Spoon the sweetened strawberries over the cheesecake filling on each cookie.

Serve: Serve the cookies chilled or at room temperature.