Heat the oven: Preheat to 425°F (220°C). Line a large sheet pan with parchment for easy cleanup.
Prep the veggies: Add bell peppers, red onion, cherry tomatoes, and corn to the pan.
Drizzle with 1 tablespoon olive oil, season with 1 tablespoon taco seasoning and a big pinch of salt and pepper. Toss to coat and spread into an even layer, leaving space for the protein.
Add the protein: On the open side of the pan, scatter the ground turkey or chicken in small clumps. Drizzle with the remaining olive oil and sprinkle on 1–2 tablespoons taco seasoning and a pinch of salt.
If using tofu, crumble it into bite-size pieces and season the same way.
Roast: Bake for 15 minutes. Stir the veggies, break up and flip the protein, and add the black beans to the veggie side. Return to the oven for 7–10 more minutes, until the protein is cooked through and the veggies have some char on the edges.
Finish with lime: Remove from the oven.
Add lime zest and juice over everything and toss gently. Taste and adjust salt, pepper, or extra taco seasoning as needed.
Build your bowls: Add a scoop of brown rice or quinoa to each bowl (or keep it grain-free). Top with the roasted protein and veggies, beans, avocado, a dollop of Greek yogurt, and cilantro.
Serve with lime wedges.