3 tablespoons extra-virgin olive oil
2 pounds ground beef
Kosher salt and freshly ground pepper
1 medium onion, diced (about 1 cup)
1 small green bell pepper, seeded and diced (about 1/2 cup)
2 large cloves garlic, finely chopped
1/4 cup chili powder, plus more to taste
2 teaspoons dried oregano
1 1/2 teaspoons ground cumin
3 15-ounce cans red kidney beans, drained and rinsed
1 28-ounce can diced tomatoes
1 15-ounce can tomato sauce
1 10-ounce bag frozen corn kernels
Sour cream, for serving
Grated cheddar cheese, for serving