Blueberry Oat Bars

1 3/4 cups Quaker Oats, uncooked (quick or old-fashioned)
1 1/2 cups All-purpose flour
3/4 cup Brown sugar, firmly packed
1/2 cup Chopped nuts
1/2 tsp Baking soda
1/2 tsp Salt (optional)
3/4 cup Margarine or butter; melted
2 cups Fresh or frozen blueberries
1/2 cup Granulated sugar
3 tbsp Water
2 tbsp Cornstarch
2 tsp Lemon juice

Preheat oven to 350 degrees F. Grease an 11x7-inch glass baking dish.

Combine oats, flour, brown sugar, nuts, baking soda and salt. Add margarine, mixing until crumbly. Reserve 3/4 cup mixture; press remaining mixture onto bottom of prepared dish. Bake 10 minutes.

Meanwhile, combine blueberries, granulated sugar and 2 tablespoons water. Bring to a boil, simmer 2 minutes, uncovered, stirring occasionally.

Combine remaining 1 tablespoon water, cornstarch, and lemon juice; mix well. Gradually stir into blueberry mixture; cook and stir about 30 seconds or until thickened.

Spread over partially baked base to within 1/4 inch of edge; sprinkle with reserved oat mixture.

Bake 18 to 20 minutes or until topping is golden brown. Cool on wire rack; cut into bars. Store tightly covered.