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Pre-heat oven to 350°F. Line 13 x 9 baking dish with parchment paper and set aside.
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Combine butter and brown sugar in a large mixing bowl. Beat together until fluffy. Add in the egg and beat until smooth. Add in the molasses and beat until well combined.
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Add the flour, baking soda, cinnamon, ginger, cloves and salt and mix until combined.
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Press cookie dough into baking dish and bake for 15-18 minutes. Remove from oven and cool completely before frosting.
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For the frosting, beat butter and cream cheese for 4 minutes, until smooth and creamy. Add in powdered sugar and vanilla and beat an additional 4 minutes until light and fluffy.
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Spread frosting over cooled bars. Add sprinkles and enjoy.
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Store in airtight container for up to one week.