Combine oats, flour, brown sugar and margarine; mix until crumbly.
Reserve 1 cup for topping; set aside.
Press oat mixture onto bottom of ungreased 8 or 9-inch square baking pan.
Bake 13 to 15 minutes or until light golden brown. Cool slightly.
In medium bowl, combine blueberries, Raspberry Preserves, flour, and lemon peel; mix gently. Spread over crust. Sprinkle with the reserved cup of oat mixture, patting gently.
Bake 20 to 22 minutes or until light golden brown.
Cool completely; cut into bars.
Store tightly covered.
Notes
Ideal healthy little snacks that the children adore and are always a source of a smile.