Oven to 350 degrees (325 for glass baking dish). Grease 9x13. Stir together flour, cocoa, baking powder and salt. With spoon or whisk, stir together butter, sugar and vanilla in large bowl. Add eggs; stir until well blended. stir in flour mixture, blending well. Stir in chocolate pieces. Spread batter in prepared pan. Bake 30-35 minutes or until brownies begin to pull away from sides of pan. Cool completely in pan on wire rack; cut into 2 inch squares.
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