Grease a 9 or 10 inch cast iron skillet. Preheat oven to 400°F (200°C).
Combine all-purpose flour, baking powder, salt, sugar, and butter in a food processor. Pulse until it resembles coarse breadcrumbs.
Pour milk through feed tube and continue to pulse until dough just comes together.
Transfer dough to a large bowl. Gently fold in cranberry sauce.
Transfer to prepared cast iron skillet. Score dough about ½ inch deep into 8 wedges.
Bake in the oven for 35 minutes or until golden brown.