Oatmeal Cream Pie Bars

"Topped with a marshmallow frosting, these softy and chewy oatmeal cream pie bars are reminiscent of the beloved packaged snack. Bake them for a dose of sweet nostalgia!..."

INGREDIENTS
1 1/4 cups (150g) King Arthur Unbleached All-Purpose Flour
1 teaspoon salt
1/2 teaspoon baking soda
12 tablespoons (170g) unsalted butter at room temperature
3/4 cup (160g) dark brown sugar or light brown sugar packed
1/3 cup (66g) granulated sugar
1 1/2 teaspoons cinnamon preferably Vietnamese
3/4 teaspoon ginger
1 1/2 teaspoons King Arthur Pure Vanilla Extract
2 large eggs
1 3/4 cups (156g) quick-cooking oats or instant oats*
3/4 cup (138g) vegetable shortening or 8 tablespoons (113g) unsalted butter softened
3/4 cup (85g) confectioners' sugar
1 cup (128g) Marshmallow Fluff or 1 cup (123g) marshmallow crème store-bought*
1/2 teaspoon King Arthur Pure Vanilla Extract
1 teaspoon water
1/4 teaspoon salt
sprinkles optional
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