2 1/4 cups pastry flour |
1 1/4 cups sugar |
1 tablespoon baking powder |
1 teaspoon salt |
1/3 cup vegetable oil |
3/4 cup buttermilk (room temperature) |
1 tablespoon vanilla (or use 2 teaspoons orange-flavor extract) |
1 orange, zest of (or to taste) |
1/4 cup fresh orange juice |
2 egg yolks (room temperature) |
2 egg whites (room temperature) |
1/4 cup sugar |
orange food coloring (optional) |
1/2 cup butter, room temperature |
3 1/4 cups icing sugar (more as needed) |
1 teaspoon vanilla |
1 tablespoon grated orange zest |
2 tablespoons fresh orange juice |
orange food coloring (optional) |
orange sprinkles or colored sprinkles |