I do a tuna rice bake.

2 cups of uncooked rice
Stick of celery finely diced
1 onion finely chopped
Tin of cream of mushroom soup
Can of tuna drained

Cook rice first then chuck in an oven proof dish with the other ingredients, mix it up and put in oven for about 20 min at 180 degrees.

Sometimes I also add corn or sliced gherkins for something different.