"Graham cracker crumbs give these bars their distinct flavor. But, they wouldn't be s'mores without the milk chocolate and marshmallows...."
INGREDIENTS
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1 1/4 cups flour
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1 cup graham cracker crumbs (about 6 sheets)
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1/2 teaspoon baking soda
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3/4 teaspoon salt (see Ingredient Note)
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3/4 cup butter, softened
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1/2 cup sugar
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1/2 cup brown sugar
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1 egg
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1 teaspoon vanilla
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1 1/2 cups milk chocolate chips, divided
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3 to 3 1/2 cups mini marshmallows