"Recipe adapted from America's Test Kitchen..."
INGREDIENTS
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12 tbsp salted butter, divided
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3/4 cup brown sugar
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1/2 cup granulated sugar
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2 tsp vanilla extract
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1/4 tsp salt
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1 large egg, plus 1 large egg yolk
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1 3/4 cups all purpose flour
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1/2 tsp baking soda
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1/2 cup mini chocolate chips
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1/2 cup white chocolate chips
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1/2 cup mini M&M candy pieces
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!For topping (optional)
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Vanilla ice cream
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hot fudge sauce
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caramel ice cream topping