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HEAT oven to 350ºF.
BEAT butter and sugar in large bowl with mixer until well blended. Add combined oats, flour and baking soda; mix well. Press 3 cups onto bottom of 13x9-inch pan sprayed with cooking spray.
MICROWAVE chocolate in small microwaveable bowl on HIGH 1-1/2 min. or until melted, stirring after 45 sec. Stir in peanut butter. Carefully spread over crust; sprinkle with remaining crumb mixture.
BAKE 22 to 25 min. or until edges are golden brown.