"**very heavily adapted from Just a Pinch..."
INGREDIENTS
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Bars:
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1 cup (2 sticks) salted butter, slightly softened
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3/4 cup light brown sugar
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1/2 cup granulated sugar
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1 teaspoon vanilla extract
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2 large eggs
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1 1/2 cup all-purpose flour
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1 teaspoon baking soda
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1/8 teaspoon ground cinnamon
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1 1/2 cup quick cooking oats
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Frosting:
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1 stick salted butter, slightly softened
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1/4 cup heavy whipping cream
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1 tsp vanilla extract
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7 oz jar marshmallow creme
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3 cups powdered sugar