Black Bean, Rice & Vegetable Tacos

olive oil

small onion, finely diced

green bell pepper, finely chopped

red bell pepper, finely chopped

black beans, drained and rinsed

bag (10 oz) shredded cabbage, or 3 cups shredded

frozen corn

ready-to-serve brown rice (do not follow directions to cook)

juice of 1 lime

packet taco seasoning

garlic clove, minced or pressed

corn tortillas

diced tomato, shredded cheese, sour cream for garnish