Mark's Daily Apple's Moroccan Chicken Casserole
http://www.marksdailyapple.com/moroccan-chicken-casserole/
Here's a Paleo Pot Pie recipe, which is pretty much a casserole
http://cosmopolitanprimalgirl.wordpress.com/2009/12/20/paleo-chicken-pot-pie/
This breakfast casserole is a good one
http://www.livestrong.com/recipes/paleo-reloaded-breakfast-casserole/
Roasted Vegetable Ratatouille
http://www.livestrong.com/recipes/paleo-reloaded-roasted-ratatouille-vegetables/
I have a bunch of slow cooker/stew recipes, not as many one dish casserole recipes.
Italian Chicken
http://www.livestrong.com/recipes/paleo-reloaded-italian-chicken/
Fall Apart Pork Stew (This is a long cooked oven recipe, but could be thrown in crock pot)
http://www.livestrong.com/recipes/fall-apart-pork-stew/
Sausage & Butternut Squash Stew
http://www.livestrong.com/recipes/sausage-butternut-squash-stew/
Sweet Potato Beef Stew
http://www.livestrong.com/recipes/paleo-reloaded-roasted-ratatouille-vegetables/