PREHEAT oven to 350°F. Mix flour, brown 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 pecans; mix well.
PRESS half of the crumb mixture firmly onto bottom of greased 13x9-inch baking pan; sprinkle with chopped chocolate. Spoon jam over top; sprinkle with remaining crumb mixture.
BAKE 25 to 30 min. or until lightly browned. Cool completely on wire rack.