Grease a 9″x13″ casserole with vegetable oil or butter.
Cut up French bread into cubes and add to casserole (fill up to ~3/4).
In a large bowl, combine eggs, milk, vanilla extract, cinnamon, and brown sugar. Whisk mixture and mix well. Pour mixture into casserole.
Slice strawberries. Top casserole with strawberries and blueberries.
Wrap the casserole with Saran Wrap and refrigerate for at least 4 hours or overnight.
Preheat the oven to 350°F. Bake for 35–50 minutes, checking at the 35-minute mark. If the casserole is not fully heated through, continue baking until done.
Sprinkle with powdered sugar. Serve with maple syrup and enjoy!
