1/2 tablespoon unsalted butter
2 cups all-purpose flour
1 cup granulated sugar
1 teaspoon salt
2 teaspoons baking powder
1/2 teaspoons baking soda
1/2 teaspoon cinnamon
1/2 teaspoon nutmeg
8 tablespoons unsalted butter, melted
1 15-ounce can pure pumpkin puree
3 eggs
1/4 cup fresh orange juice
1 teaspoon vanilla extract