Step 1

Heat oven to 350°F. In large bowl, mix all filling ingredients except pineapple and blueberries with spoon until well blended. Fold in pineapple and blueberries. Spread in ungreased 8-inch square pan.

Step 2

In small bowl, mix all topping ingredients except butter. Cut in butter, using pastry blender (or pulling 2 table knives through ingredients in opposite directions), until particles resemble fine crumbs. Sprinkle over blueberry mixture.

Step 3

Bake 45 to 50 minutes or until golden brown and toothpick inserted in center comes out clean.

Step 4

Meanwhile, in 1-quart saucepan, mix brown sugar and cornstarch. Add enough water to reserved pineapple juice to measure 2/3 cup; stir into brown sugar mixture. Cook over medium heat, stirring constantly, until mixture boils. Boil and stir 1 minute; remove from heat. Stir in lemon juice. Serve over warm dessert.