"makes 16 bars..."
INGREDIENTS
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2 1/4 cups flour
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1 tsp baking soda
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1 tsp salt
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1 cup butter
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1 cup dark brown sugar
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1/4 cup granulated sugar
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2 eggs, plus one egg yolk
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1 Tbsp vanilla
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3/4 cup Nutella
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*optional, flaked sea salt to garnish