Chili with Shrimp

1 15 ounce can petite diced tomatoes
1 cup kidney beans or black beans
1 small onion, chopped
1 4 ounce can mild diced green chili peppers
1 cup frozen shrimp
chili powder to taste

Combine all ingredients in pan, tasting for spice. Cook until onions are tender. Add shrimp and cook until hot.