Heat oven to 325°F.

Grease bottom of 13x9x2-inch baking pan.

Beat butter, cream cheese and sugar in large bowl until light and fluffy.

Beat in eggs and vanilla.

Combine flour, cocoa, baking powder and salt; gradually add to butter mixture until well blended.

Stir in nuts.

Spread batter into prepared pan.

Bake 35 to 40 minutes or just until brownies begin to pull away from sides of pan.

Cool completely in pan on wire rack.

Cut into bars