Preheat oven to 425 degrees. In a bowl, whisk together flour, 5 tablespoons sugar, baking powder, and salt. Cut in butter with a pastry blender or two knives until mixture resembles coarse crumbs. Stir in 2/3 cup half-and-half (may need more) and vanilla until just moistened. May need more liquid to make batter come together. Gently fold in cranberries.

On a lightly floured surface, knead dough gently, 5 to 10 times. Pat into a 1-inch-thick round. Cut into 8 wedges; place on a baking sheet, 2 inches apart. Bake until golden brown, 12 to 15 minutes. Let cool on a wire rack.