Corn Chowder with chicken

1 (10 ounce) box frozen corn in butter sauce 1 tablespoon olive oil 1 medium onion , chopped (1/2 cup) 1 medium bell pepper , chopped (1 cup) 1 stalk celery ,[...]

6 tablespoons butter 1 large red bell pepper (chopped) 1 medium onion (chopped) 3 minced garlic cloves 1 (14 1/2 ounce) can diced tomatoes with juice 2 cups[...]