If using fresh corn on the cob, grill to your liking. Slice corn off the cob using a sharp knife.
In a large bowl, combine corn, black beans, cherry tomatoes, red onion, jalapeno, cilantro, and cotija cheese. Stir to combine.
In a small bowl, combine olive oil, lime juice, salt, pepper, and chili powder. Whisk to combine.
Pour dressing over the salad. Stir to combine.
Serve immediately or place in fridge to let the flavors blend together. Stir before serving.
Store in the fridge for up to 5 days.