"This moist and flavorful sweet potato sheet cake with cream cheese frosting is great for gatherings, fall holidays, or when you want a comforting treat...."
INGREDIENTS
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2 1/2 cups all-purpose flour
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2 teaspoons baking powder
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1 teaspoon baking soda
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2 teaspoon ground cinnamon
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1/2 teaspoon ground nutmeg
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1/2 teaspoon ground ginger
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1/2 teaspoon ground allspice
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1/2 teaspoon salt
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1 cup light brown sugar, packed
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1/2 cup granulated sugar
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3/4 cup vegetable oil
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3 large eggs
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1/4 cup sour cream
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2 cups mashed sweet potatoes
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2 teaspoons vanilla extract
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8 ounces cream cheese, softened
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1/2 cup unsalted butter, softened
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4 cups powdered sugar, sifted
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1 teaspoon vanilla extract
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2-3 tablespoons heavy cream, adjust for consistency
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1/2 teaspoon cinnamon, optional
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Crushed Biscoff or Gingersnap cookies, for garnish