Brownie Bars

1 package (8 ounces) cream cheese, divided
1-1/2 cups sugar, divided
1 cup plus 2 tablespoons all-purpose flour, divided
1 cup butter, divided
3 eggs, divided
2-1/2 teaspoons vanilla, divided
2 squares (1 ounce each) unsweetened chocolate, divided
1-1/4 cups chopped walnuts, divided
1 teaspoon baking powder
1 cup (6 ounces) semisweet chocolate chips
2 cups miniature marshmallows
1/4 cup milk
3 cups confectioners' sugar

In small mixing bowl, blend 6 ounces cream cheese, 1/2 cup sugar, 2 tablespoons flour, 1/4 cup butter, 1 egg and 1/2 teaspoon vanilla; set aside. In a medium saucepan, over medium heat, melt 1 square chocolate and 1/2 cup butter. Remove from heat; stir in 1 cup sugar, 1 cup flour, 1 cup nuts, baking powder, 1 teaspoon vanilla, and 2 eggs; until well blended.

Spray 13-in. x 9-in. x 2-in. pan with non-stick spray; spread batter in pan. Spread cheese mixture over batter. In small bowl, combine 1/4 cup nuts and chocolate chips; sprinkle over cheese layer.

Bake at 350 degrees for about 28 minutes or until almost done. Sprinkle marshmallows over all; bake for 2 minutes longer. In a medium saucepan, melt 1/4 cup butter, 1 square chocolate, 2 ounces cream cheese and milk.

Remove from heat; stir in confectioners' sugar and 1 teaspoon vanilla. Immediately drizzle over marshmallows. Chill well; cut into bars. Makes 30 bars.