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Preheat oven to 350.
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In a mixing bowl, combine cream cheese, ¼ cup sugar and 1 egg and beat until smooth.
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Stir in 1 cup white chocolate chips until well combined. Set aside.
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On the stove, fill a saucepan with water and bring to a boil. Turn off heat and set a heatproof mixing bowl over the water. In the mixing bowl, combine butter and milk chocolate chips; stir until its just melted and blended together. Mix in the remaining ½ cup sugar and 2 eggs.
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In a separate bowl, mix your flour, baking powder, and salt; stir into your chocolate mixture until evenly blended.
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Pour half of your batter into a greased 9×9 baking pan. Spread the cream cheese mixture over the chocolate layer. Top with remaining chocolate mixture. Swirl the top chocolate layer into the cream cheese to make a marble pattern.
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Bake at 350 degrees for 25 to 30 minutes, or until top is crinkled and center is cooked through. Let cool. ENJOY!