From “Cupcake Cookbook for Kids”
Nonstick cooking spray (or cupcake liners)
8 tablespoons (1 stick) unsalted butter at room temperature
1/2 cup buttermilk (or 1/2 cup milk + 1/2 teaspoon vinegar)
Juice of 1 orange
1 teaspoon vanilla
1 3/4 cup all-purpose flour
1 teaspoon baking powder
1/2 teaspoon baking soda
1/2 teaspoon salt
1 cup sugar
zest of 3 oranges
1/4 cup orange marmalade
3 large eggs
(For the filling: 3 ounces full-fat cream cheese + 3 heaping tablespoons orange marmalade)