"The Best Blondies I've ever had! This easy, one-bowl blondie recipe yields extra chewy, buttery, rich, blondies with hardly any effort at all!..."
INGREDIENTS
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1 cup unsalted butter (melted and cooled slightly)
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1 2/3 cups brown sugar (packed)
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2/3 cup granulated sugar
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2 eggs (room temperature)
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1 egg yolk (room temperature)
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1 tbsp vanilla extract
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2 1/4 cups all purpose flour
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2 tbsp corn starch
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1 tsp baking powder
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1 tsp salt
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1 cup butterscotch, peanut butter, semi-sweet, or white chocolate chips