Lightly spray a 9x13 inch baking dish with non-stick spray.
In a large bowl whisk together eggs, milk, vanilla, sugar, and cinnamon. Slice the bread into cubes.
Layer about 1/2 of the cups into the bottom of the baking dish. Sprinkle with 1/2 cup blueberries.
Pour egg mixture evenly over the bread. Top with remaining bread and blueberries.
Wrap in plastic wrap, and gently press down so the bread gets in the egg mixture. Place in the fridge for at least 3 hours, or over night.
Preheat oven to 350 degrees.
In a small bowl mix together brown sugar and cinnamon. Sprinkle evenly over the french toast mixture.
Place in the oven and cook for 35-45 minutes until the bread puffs up and it is cooked all the way through.
Top with more berries, powdered sugar or maple syrup