Crock Pot Mexican Casserole

Ingredients
1 cup uncooked brown rice
3 cups water
1 8 oz can of tomato sauce
1 teaspoon salt (optional)
1 teaspoon onion powder
1 teaspoon chili powder
½ teaspoon garlic powder
½ teaspoon cumin
2 cups cooked beans (or 1 can drained beans)
1 cup corn (optional)
Instructions
Pour all of the ingredients into your slow cooker and stir gently.
Cook on high for 4 hours or low for 6-8 hours.
Depending on consistency, you may have to add additional water towards the end.
How many does this serve?