01 - In a medium bowl, whisk together the flour, baking powder, and salt. Set aside.
02 - In a large bowl, beat the softened butter and granulated sugar together using an electric mixer until light and fluffy, approximately 3 minutes. Add the egg, orange juice, orange zest, and vanilla extract, beating until fully incorporated.
03 - Gradually add the dry ingredient mixture to the wet ingredients, mixing on low speed until a soft, cohesive dough forms. Divide the dough in half, flatten each portion into a disc, wrap tightly in plastic wrap, and refrigerate for at least 30 minutes.
04 - While the dough chills, beat the softened cream cheese and butter together in a small bowl until smooth and creamy. Add the powdered sugar, orange marmalade, vanilla extract, orange zest, and a pinch of salt. Mix until all ingredients are well combined and the filling is uniform in texture.
05 - Preheat the oven to 350°F. Line two baking sheets with parchment paper and set aside.
06 - On a lightly floured surface, roll one portion of chilled dough to 1/8-inch thickness. Using a 2.5-inch round cookie cutter, cut out as many circles as possible. Re-roll scraps and repeat with the second portion of dough.
07 - Place 1 teaspoon of creamsicle filling in the center of each dough circle. Fold three edges of the circle upward to form a triangle, pinching the corners firmly to seal and create the traditional hamentaschen shape.
08 - Arrange the shaped cookies on the prepared baking sheets, spacing them about 1 inch apart. Bake for 12 to 14 minutes, or until the edges are lightly golden.
09 - Allow the cookies to cool on the baking sheets for 5 minutes, then transfer to a wire rack to cool completely. Store in an airtight container at room temperature for up to 4 days.