Heat oil in a large skillet over medium-high heat.
Add the beef and cook for about 10 minutes, stirring constantly while breaking it apart with a wooden spoon.
Add in the taco seasoning, onions, garlic, and peppers.
Season with salt and pepper, to your taste.
Cook, stirring occasionally, until vegetables have softened and meat has browned and cooked through.
Make some space in the skillet and add in the cooked brown rice, tomatoes, cilantro/parsley, black beans and corn.
Gently combine, and let heat through over low temperature for 5 minutes.
Garnish with fresh lime wedges and enjoy!
Store in the refrigerator in airtight containers. Can be kept refrigerated for up to 4 days.