HEAT oven to 350°F.

LINE 13x9-inch pan with foil, with ends of foil extending over sides. Spray with cooking spray. Mix flour, sugar and baking powder in large bowl. Cut in butter with pastry blender or 2 knives until mixture resembles coarse crumbs. Add oats, coconut and nuts; mix well.

PRESS half the crumb mixture into bottom of pan; sprinkle with chocolate. Spoon jam over top; cover with remaining crumb mixture.

BAKE 25 to 30 min. or until lightly browned. Use foil handles to remove transfer dessert from pan to wire rack. Cool completely before cutting into bars.