1/2 cup (1 stick) unsalted butter (melted)
4 large eggs (divided)
1 1/2 cups buttermilk
  grated rind of 3 oranges
1/2 cup rolled oats (not instant)
1 1/2 cups unbleached all-purpose flour
1 teaspoon bakind soda
2 teaspoons baking powder
1 teaspoon salt
1/4 teaspoon ground nutmeg
1/3 cup Sugar