First things first, if you haven't already, cook your rice according to package directions. While the rice is doing its thing, you can prep everything else.
In a small bowl, whisk together all the dry blackened seasoning spices (chili powder, smoked paprika, garlic powder, onion powder, cumin, cayenne, salt, and black pepper).
Pat your fish fillets really dry with paper towels. This helps the seasoning stick and gives you a better sear. Rub the fish on both sides with the olive oil, then generously sprinkle and rub the blackened seasoning all over the fillets. If the seasoning blend seems a little dry, you can mix the 1 tbsp lime juice into the dry spices to make a sort of paste before rubbing it on the fish.
Heat a skillet (cast iron is great for this!) over medium-high heat. Once hot, add the seasoned fish. Cook for about 3-5 minutes per side, depending on the thickness of the fillets, until the fish is opaque and flakes easily with a fork. Don't overcrowd the pan; cook in batches if needed.
While the fish is cooking or right after, warm up your black beans and corn if they aren't already warm (a quick zap in the microwave works!).
Now for the fun part: assembling the bowls! Divide the cooked rice among your serving bowls.
Top the rice with spoonfuls of the warm black beans and corn, a generous portion of the shredded lettuce or cabbage, the pico de gallo or diced tomatoes, and some creamy diced avocado.
Break the cooked blackened fish into chunks and add it to each bowl.
Finish each bowl with a sprinkle of crumbled cotija or feta cheese, a dollop of Greek yogurt or sour cream, a squeeze of fresh lime juice from your extra lime, and a sprinkle of fresh cilantro.
Serve immediately and enjoy all those amazing flavors!