01 - Beat the softened butter and cream cheese in a large bowl with an electric mixer until smooth and creamy, approximately 2 minutes.
02 - Add the granulated sugar and continue beating until the mixture becomes light and fluffy, scraping down the sides of the bowl as needed.
03 - Mix in the egg and vanilla extract until fully combined and homogeneous.
04 - Whisk together the all-purpose flour, baking powder, and salt in a separate bowl, then gradually add to the wet mixture, mixing until just combined. Do not overmix.
05 - Cover the dough tightly and refrigerate for at least 30 minutes to firm up for easier scooping and handling.
06 - Preheat the oven to 350°F and line two baking sheets with parchment paper.
07 - Scoop heaping tablespoons of chilled dough onto the prepared baking sheets, spacing them approximately 2 inches apart to allow for spreading.
08 - Use the back of a spoon to gently press an indent into the center of each dough portion.
09 - Dollop about 1/2 teaspoon of slightly cooled caramel sauce into each indent, then swirl gently with a knife or toothpick for a marbled effect.
10 - Bake for 11 to 13 minutes, or until the edges are lightly golden. The centers may appear slightly underdone but will set as they cool.
11 - Allow the cookies to rest on the baking sheet for 5 minutes, then transfer to a wire cooling rack to cool completely before serving.