Spray a 9x9" pan with cooking spray. Set aside.

In medium sausepan .melt butter. Add Brown sugar and vanilla. Stirring until blended. Stir in oats. Cook several minutes until mixture is hot and well blended. Press half into bottom of prepared pan.set remainder aside.

Melt together peanut butter and dark & semi sweet chips stirring until smooth. Pour chocolate mixture over crust.Spreading to evenly coat. Crumble the set aside muxture over the top. Pressing genltly.

Chill until chocolate is set before cutting.