INGREDIENTS
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Cookie Cake
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3/4 cup unsalted butter, room temperature
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3/4 cup dark brown sugar
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1/4 cup sugar
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1 egg
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2 tsp vanilla extract
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2 cups all purpose flour
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2 tsp cornstarch
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1 tsp baking soda
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1/2 tsp salt
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1 1/4 cups semi-sweet chocolate chips OR about 1 cup of chocolate chunks
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Vanilla Buttercream
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1/2 cup butter
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1/2 cup shortening
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4 cups powdered sugar
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1 tsp vanilla extract
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2-3 tbsp water