In a large skillet, heat the olive oil over medium heat.
Add the chopped onion, diced red bell pepper, and minced garlic. Sauté for 2-3 minutes or until the vegetables start to soften.
Add the canned black beans, canned corn, and diced tomatoes to the skillet. Stir well.
Season the mixture with ground cumin, chili powder, salt, and pepper. Stir to combine all the ingredients.
Cook the mixture for another 5-7 minutes, or until it's heated through and the flavors have melded together.
Squeeze the juice of one lime over the mixture and stir. Remove the skillet from heat.