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1
Beat (6 ounces) 3/4 cup cream cheese at medium speed with an electric mixer until smooth.
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2
Add 1/2 cup sugar, 2 tablespoons flour, 1/4 cup butter, 1 egg, and 1/2 teaspoon vanilla; beat until blended.
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3
Set cream cheese batter aside.
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4
Microwave 1/2 cup butter and 1 square unsweetened chocolate in a 1-quart microwave-safe bowl at HIGH 1 minute or until melted, stirring once.
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5
In another bowl, beat 2 eggs at medium speed, and gradually add remaining 1 cup sugar, beating well.
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6
Add 1 teaspoon vanilla extract to the egg/sugar mixture, and beat until blended.
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7
Add 1 cup flour and baking powder to the egg/sugar/vanilla mixture, beating well.
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8
Add melted chocolate to the egg/sugar/vanilla/flour mixture, and beat until chocolate batter is blended.
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9
Stir in 1 cup chopped walnuts.
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10
Pour chocolate batter into a greased 13- x 9-inch pan.
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11
Top with cream cheese batter.
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12
Sprinkle with remaining 1/4 cup chopped walnuts and the one cup of chocolate chips.
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13
Bake at 350u00b0 for 24-28 minutes.
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14
Sprinkle with marshmallows, and bake 2 more minutes.
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15
Combine remaining 1/4 cup butter, remaining 1/4 cup cream cheese, remaining 1 square unsweetened chocolate, and milk in a saucepan.
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16
Cook over medium heat, stirring constantly, until butter and chocolate melt.
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17
Stir in powdered sugar and remaining 1 teaspoon vanilla. (If frosting is too thick, add a tad more milk until desired spreading consistency).
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18
Drizzle or spread over brownies.
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19
Chill; cut into squares.