- HEAT oven to 350ºF.
- MICROWAVE butter and chocolate squares in large microwaveable bowl on HIGH 1-1/2 minutes or until butter is melted, stirring after 45 seconds. Stir until chocolate is completely melted. Stir in sugar. Blend in eggs and vanilla. Add flour and cocoa powder; mix well.
- SPREAD onto bottom of 9-inch square pan sprayed with cooking spray. Top with small spoonfuls of peanut butter; gently with knife. Sprinkle with salt.
- BAKE 18 to 20 minutes or until toothpick inserted in center comes out with fudgy crumbs. (Do not overbake.) Cool completely.
- TIP: Sitr 1/4 cup peanut butter chips into batter before spreading into pan.