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Beat the softened cream cheese, sugar, egg yolk, mint extract, and food coloring in a medium bowl with an electric mixer until the mixture is completely smooth. (about 1 minute).
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Add the mini chocolate chips, stir in by hand.
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Measure out large spoonfuls of the cream cheese mixture.
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Dollop the spoonfuls on top of the prepared brownie batter. Next add the dollops of rest of the brownie batter to the top of the brownie batter.
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Using a knife create a swirl effect to mix the cream cheese mixture and the additional brownie batter.
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Sprinkle additional mini chocolate chips on top.
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Bake brownies at 350 degrees for 35-40 minutes. (Or until a toothpick comes out almost clean)
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Remove from the oven.
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Set aside until they have cooled.
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Cut them into squares.