I made this for Thanksgiving dinner and it was a big hit. It is a bit messy to serve, but who cares--the flavors and textures are wonderful. Baked for 12 minutes, then threw on the broiler to get a golden brown top to the crust. Had to modify the topping by adding a second can of pie filling--one just doesn't cover a 13x9 inch baking pan. I made half blueberry and the other with cherry pie filling. I think the cherry went first, but it was enjoyed by all.
This has been a favorite of my family for years, although I'm not sure where it came from either! I've looked everywhere for the recipe as my mom lost hers and relies on memory to make. Delicious!