Step 1: Cook the rice according to package instructions. Once finished, fluff with a fork and stir in half of the chopped cilantro and a squeeze of lime juice.
Step 2: In a large skillet over medium-high heat, brown the ground beef until no pink remains. Drain any excess grease.
Step 3: Add the taco seasoning and 1/2 cup of water to the skillet. Stir well and simmer for 5 minutes until the sauce thickens and coats the beef.
Step 4: In the final 2 minutes of cooking the meat, stir in the black beans and corn to warm them through.
Step 5: Assemble the bowls by starting with a base of rice, followed by a generous portion of the taco beef mixture.
Step 6: Top with shredded lettuce, diced tomatoes, shredded cheese, avocado slices, and the remaining cilantro.
Step 7: Garnish with a dollop of sour cream and serve with lime wedges on the side.