Preheat oven to 350F. Cut bread into 1 inch cubes. Place half in greased 13 x 9 x 2 inch baking dish. Cut cream cheese into cubes; place over bread. Top with blueberries and remaining bread. In a large bowl combine eggs, milk and syrup; Mix well. Pour over bread mixture. Cover and chill 8 hours or overnight. Remove from refrigerator 30 minutes before baking. Cover, bake 25-30 minutes or until set. Uncover. Bake 30 additional minutes or until golden brown and center is done.
Combine sugar and cornstarch. Bring to a boil for 3 minutes. Stir in blueberries, reduce heat, Simmer 8-10 minutes. Stir in butter until melted. Serve over French toast.
Cajun Country -- New Iberia, Louisiana