Lightly grease a 9x13-inch pan and place French bread cubes in it. Sprinkle the bread cubes with the cinnamon.
In a medium bowl, whisk together eggs, brown sugar, whole milk, and vanilla extract. Pour mixture over bread cubes. Use the back of a spoon to press bread cubes into liquid.
Spoon apple pie filling evenly on top. Cover and refrigerate for 1 hour or overnight.
Remove from refrigerator and heat oven to 350 degrees.
While oven heats make the streusel. Mix together light brown sugar, all-purpose flour, and quick-cooking oats. Sprinkle over the casserole.
Bake for 45 to 50 minutes. Drizzle with caramel sauce and serve.