Whisk the flour, brown sugar, baking powder, nutmeg, and salt together in a large mixing bowl until thoroughly combined.
Cut in the cold butter, then add the half and half and egg. Mix just until a shaggy dough begins to form.
Fold in the cranberries, granulated sugar, and orange zest gently, stirring lightly so the dough remains tender.
Transfer the dough onto a lightly floured surface and knead just until it holds together.
Pat into a circle about 6 inches across and 1 inch thick, then cut into 8 wedges.
Arrange the wedges in the air fryer basket in a single layer, spacing them apart.
Set the air fryer to 365°F (185°C) and cook for 10 to 12 minutes, checking around the halfway point — exact time depends on your air fryer. They're done when golden on top and set in the center.
Cool on a wire rack. Glaze once fully cooled, if desired.