01 - In a medium bowl, whisk together the all-purpose flour, baking powder, and salt until evenly combined.
02 - In a large bowl, beat the softened unsalted butter and granulated sugar using an electric mixer until light and fluffy, approximately 2 to 3 minutes. Add the egg, orange juice, vanilla extract, and orange zest, continuing to beat until the mixture is smooth and well incorporated.
03 - Gradually add the dry ingredient mixture to the wet ingredients, mixing on low speed until a soft dough just comes together. Flatten the dough into a disk, wrap tightly in plastic wrap, and refrigerate for at least 1 hour or until firm enough to roll.
04 - In a small bowl, combine the softened cream cheese, powdered sugar, orange zest, orange marmalade, and vanilla extract. Stir until completely smooth and free of any lumps. Set aside.
05 - Preheat the oven to 350°F. Line two baking sheets with parchment paper and set aside.
06 - On a lightly floured surface, roll out the chilled dough to 1/8-inch thickness. Using a 3-inch round cookie cutter, cut out as many circles as possible. Re-roll scraps and repeat until all dough is used.
07 - Place 1 teaspoon of the creamsicle filling in the center of each dough circle. Fold up three sides of the circle to form a triangle, pinching the corners firmly to seal and create the traditional hamantaschen shape.
08 - Place the shaped cookies on the prepared baking sheets, spacing them about 1 1/2 inches apart to allow for slight spreading during baking.
09 - Bake for 12 to 14 minutes, or until the edges are lightly golden. Remove from the oven and allow the cookies to cool on the baking sheets for 5 minutes before transferring to a wire rack to cool completely.