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Lightly spray a 9x9 inch pan with non-stick cooking spray and line with parchment paper or foil.
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Combine sugar, graham cracker crumbs, and melted butter then press evenly into the bottom of the pan.
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In a microwave safe dish, heat condensed milk for 1 minute.
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Add chocolate chips to hot condensed milk and stir until smooth.
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Pour chocolate over graham crackers.
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Place marshmallows on top of chocolate.
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Turn broiler on high.
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Place pan in the oven and broil until marshmallows are golden brown. Do not leave unsupervised as this only takes a couple of minutes (this can also be done with a kitchen torch).
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Refrigerate bars for 1 hour or until chocolate has set.
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These bars are pretty rich, so you will want to slice them into smaller squares.
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Makes approximately 16 squares.