01 - In a medium bowl, whisk together the flour, baking powder, and salt until evenly combined.
02 - In a large bowl, beat the softened butter and granulated sugar with an electric mixer until light and fluffy, approximately 2 to 3 minutes. Add the egg, orange juice, vanilla extract, and orange zest, then continue beating 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 to firm up.
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 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 work surface, roll the chilled dough out to an even 1/8-inch thickness. Using a 3-inch round cookie cutter, cut out as many circles as possible, re-rolling scraps as needed.
07 - 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 and prevent the filling from leaking during baking.
08 - Arrange the shaped cookies on the prepared baking sheets, spacing them about 1 1/2 inches apart. Bake for 12 to 14 minutes, or until the edges are lightly golden. Transfer to a wire rack and let cool completely before serving.