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HEAT oven to 350°F.
MIX oats, flour, sugar and baking powder in large bowl. Cut in butter with pastry blender or 2 knives until mixture resembles coarse crumbs.
PRESS 3 cups oat mixture firmly onto bottom of 9-inch square baking pan. Spread jam over crust. Mix nuts with remaining crumb mixture; sprinkle over jam.
BAKE 30 min. or until topping is lightly browned. Cool completely on wire rack.