2 cups flour
1 1/2 teaspoon baking powder
1/2 teaspoon baking soda
1/4 teaspoon salt
1/2 cup (1 stick) unsalted butter, softened
1/2 cup granulated sugar
1/2 cup dark brown sugar, packed
3 large eggs
1 1/2 teaspoon vanilla
1 teaspoon butter flavoring
1/2 cup buttermilk
1/2 cup cream soda
