Spray saucepan with cooking spray and add rice. Cook over medium heat, stirring occasionally, until lightly browned. Stir in onion and garlic. Cook for 2 to 3 min. Add hot water, bouillon cubes and tomato sauce.
Reduce heat to low. Cover and simmer for 20 min.
Add frozen vegetables. Cover and simmer for an additional 10 min. or until all moisture is absorbed.