In a large bowl, whisk together the flour, rolled oats, baking powder, orange zest, and salt.
Cut the cold butter into cubes, then rub it into the dry ingredients until the mixture resembles coarse breadcrumbs.
Add the powdered sugar, honey, vanilla extract, egg, and freshly squeezed orange juice. Knead until a smooth dough forms.
Wrap the dough in plastic wrap and chill in the refrigerator for 30 minutes.
Preheat the oven to 350°F (180°C) and line a baking sheet with parchment paper.
On a lightly floured surface, roll out the dough to a thickness of 3-4 mm. Cut out circles or linzer shapes using cookie cutters.
Place the cookies on the prepared baking sheet and bake for 12-15 minutes, or until golden brown.
Let them cool completely, then sandwich them together in pairs with orange marmalade or honey.
Before serving, dust with powdered sugar or sprinkle with grated orange zest for a prettier presentation.
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