Brown the ground beef in a skillet until cooked through. Drain well. Set aside.
Pour the beef broth into the crock pot, and add the onion soup mix and cornstarch. Whisk together until all lumps are broken up.
Next add the ground beef, stewed tomatoes, uncooked rice and Italian seasoning to the crock pot. With a large spoon mix until combined.
Place the lid on the crock pot and cook on high for 3 hours or low for 5 or 6 hours or until the rice is cooked but still has a slight bite to it.
Turn the crock pot off immediately once the rice is cooked and transfer the Italian Beef and Rice Casserole to a serving bowl to prevent the rice from overcooking.
Recipe Expert Tips
Cooking rice in a crock pot recipe can be tricky. Slightly undercooked crock pot rice is better than overcooked crock pot rice.
Once any crock pot recipe containing a large amount of rice in the ingredients is finished cooking turn off the slow cooker.
Transferring the crock pot casserole recipe with rice in it to a serving bowl will prevent the rice from overcooking and getting mushy.