In a large skillet over medium heat, add the chopped onion and minced garlic. Sauté for about 2-3 minutes until the onion becomes translucent.
Increase the heat to medium-high and add the ground beef to the skillet. Break it apart with a spatula and cook until browned, about 5-7 minutes. Drain excess fat if necessary.
Stir in the chili powder, cumin, smoked paprika, salt, and pepper, mixing well to coat the beef evenly with the spices.
Add the diced red bell pepper, corn, and black beans to the skillet. Cook for an additional 3-4 minutes until the vegetables are tender and heated through.
Stir in the diced tomatoes and cook for another 2 minutes to combine all ingredients well. Adjust seasoning to taste.
To assemble the burrito bowls, place a scoop of cooked brown rice at the bottom of each bowl. Top with the beef mixture.
Finish the bowls with diced avocado, shredded cheese, and fresh cilantro leaves. Serve with lime wedges on the side for squeezing over the top.
Notes
Feel free to customize with your favorite toppings.