INGREDIENTS
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1/2 cup all-purpose flour
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1 teaspoon baking soda
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1/2 teaspoon salt
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1/2 cup unsalted butter, room temperature
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3/4 cup packed brown sugar
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1 1/4 cups peanut butter
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1/2 cup maple syrup
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1 large egg, room temperature
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1 large egg yolk, room temperature
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1 teaspoon vanilla extract
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MARSHMALLOW FROSTING
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2 sticks unsalted butter, room temperature
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2 cups marshmallow fluff
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1 cup powdered sugar
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1/4 plus 1/8 teaspoon salt
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1 teaspoon vanilla extract