Black Bean and Tomato Rice

I made this for the first time tonight. It's one of my favorites now. It takes hardly any time and I usually have all the ingredients already. 

Ingredients:
1 red onion, chopped
2 tablespoons olive oil
1 can black beans, undrained
1 can diced tomatoes
1 teaspoon oregano
1 teaspoon garlic salt
1 cup instant rice


1. Cook onion in oil in large skillet until soft but not brown, 3-4 minutes. Add beans, tomatoes, oregano, and garlic salt. Bring to a boil. Add rice and bring mixture back to a boil. Reduce to simmer and cover.
2. Let simmer about 5 minutes. Remove from heat and let stand 5 minutes before serving.