Preheat oven to 350 degrees. In a large bowl combine flour, baking powder and salt. In a mixing bowl beat margarine and sugar until light and fluffy. Add egg and vanilla and beat until smooth. Add milk, flour mixture, and oats and beat until blended. Stir in blueberries. (batter will be stiff) Spread in greased 9-inch square baking pan. Sprinkle cereal over top. Bake at 350 degrees for 40 minutes or until golden brown and a tester comes out clean. Cool in pan on wire rack. Cut in squares. YIELD: 16 squares
Weight of unbaked batter is 695 grams; 25 ounces. Weight of baked batter is 625 grams; 22 ounces.
Don't overdo it on crushing the cereal --it's good to have some partial shapes so you can see the web pattern -- If the cereal is not crushed, it's hard to cut. Gently sweetened, cakey, cereal adds nice crunch. Life cereal also works well.
I calculated at about 110 calories per square, 26% calories from fat.