Sweet Potato Cornbread With Maple Butter

Name: Sweet Potato Cornbread With Maple Butter
Ingredients: For the cornbread:; 1 cup all-purpose flour; 1 cup yellow cornmeal; 1/2 cup granulated sugar; 1/4 cup brown sugar; 1 tablespoon baking powder; 1 teaspoon kosher salt; 1/2 teaspoon ground cinnamon; 1 cup buttermilk, at room temperature; 1 cup cooked, mashed sweet potatoes, at room temperature; 1/2 cup plus two tablespoons unsalted butter, melted, plus more for greasing the pan; 2 large eggs, at room temperature; 1/2 teaspoon vanilla extract; For the maple butter:; 2 tablespoons unsalted butter; 2 tablespoons maple syrup