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 pale, light, and fluffy.
03 - Add the egg, orange juice, vanilla extract, and orange zest to the butter mixture. Beat until the mixture is smooth and well blended.
04 - Gradually add the dry ingredient mixture to the wet ingredients, mixing on low speed until a soft, cohesive dough forms. Flatten into a disk, wrap tightly in plastic wrap, and refrigerate for at least 1 hour.
05 - In a small bowl, combine the softened cream cheese, powdered sugar, orange zest, orange marmalade, and vanilla extract. Stir until completely smooth and uniform.
06 - Preheat the oven to 350°F. Line two baking sheets with parchment paper.
07 - On a lightly floured surface, roll the chilled dough to 1/8-inch thickness. Using a 3-inch round cookie cutter, cut out circles and transfer them to the prepared baking sheets.
08 - Place 1 teaspoon of the creamsicle filling in the center of each dough circle. Fold the edges upward to form a triangle, pinching the three corners firmly to seal.
09 - Bake for 12 to 14 minutes, or until the bottoms are lightly golden. Transfer to a wire rack and let cool completely before serving.