Preheat oven to 425°.
Bring water and turmeric to a boil in a medium saucepan. Add rice; cover, reduce heat, and simmer 20 minutes or until liquid is absorbed.
Arrange peppers, corn, and onion in a single layer on a baking sheet coated with cooking spray. Coat vegetables with cooking spray. Bake at 425° for 20 minutes or until vegetables begin to brown.
Spoon vegetables into a large bowl. Add rice, cheese, and remaining ingredients; toss well.