Preheat oven to 350 degrees F.
Place 1/4 c of water in bottom of oiled 9x13 baking dish.
Put zucchini boats into dish.
In a skillet over medium heat, saute the oil and onion until soft.
Mix onion with cooked rice and beans.
Gently filled zucchinis with rice mixture.
Top with salsa.
Bake covered for 35 minutes.
Uncover and check for doneness. If you want your zucchinis softer cooked for another 5 minutes and recheck. When zucchinis are at desired softeness add cheese.
Place back in over until cheese is melted.
Top with green onions and cilantro.