Pre-heat the oven to 350 degrees F. Butter a 12-inch cast iron skillet. Sprinkle the 2 tablespoons of sugar over the cranberries and toss to coat. In a large bowl combine the flour, baking powder, cinnamon, salt, 1 1/2 cups of sugar and whisk to combine. In a small bowl whisk together the melted butter, eggs, milk and vanilla. Add the wet ingredients to the large bowl of dry ingredients and whisk well to combine.