In a microwave or in a small saucepan, melt chocolate and butter; stir until smooth. Set aside

In a small mixing bowl, beat eggs. Gradually add the sugar, beating until thick and pale yellow.

Combine the flour, baking powder, salt and cinnamon; add the egg mixture and mix well. Stir in the vanilla extract and reserved melted chocolate. Add the chocolate chips.

Pour half of the batter into a greased 8-inch square baking dish. Set aside. In a small mixing bowl, beat the butter, cream cheese and sugar until light and fluffy. Add the egg, flour and vanilla; mix well. Pour over the batter in pan. Spoon remaining batter over filling, with a knife cut through batter to create a marbled effect.

Bake at 325º for 35 to 40 minutes or when a toothpick inserted near the center comes out clean.

Cool on a wire rack. Cut into bars. Keep brownies in the refrigerator.