Season the chicken. Pat the chicken dry.
In a bowl, mix olive oil, chili powder, cumin, smoked paprika, garlic powder, onion powder, cayenne (if using), salt, pepper, and lime juice. Rub all over the chicken and let it sit while you prep the veggies.
Roast the corn and peppers. Preheat the oven to 425°F (220°C). On a sheet pan, toss corn and sliced bell pepper with a little olive oil, salt, and pepper.
Roast for 12–15 minutes, until lightly charred and tender.
Cook the chicken. You can bake or pan-sear: Bake: Place chicken on a lined sheet pan and bake at 425°F for 15–18 minutes, until the thickest part reaches 165°F (74°C).
Pan-sear: Heat a large skillet over medium-high. Add a drizzle of oil. Cook chicken 5–7 minutes per side, until browned and cooked through.
Rest and slice. Transfer chicken to a cutting board and let it rest for 5 minutes.
Slice thinly or cube.
Make the sauce. Whisk Greek yogurt, lime juice, honey, chili powder, and a pinch of salt. Add a splash of water until it’s drizzle-able. Taste and adjust lime or salt.
Warm the bases. Heat the cooked rice or quinoa and the black beans until warm.
Season beans with a squeeze of lime and a pinch of salt for extra flavor.
Assemble the bowls. Divide grains into bowls. Add black beans, roasted corn and peppers, cherry tomatoes, red onion, and avocado. Top with sliced chicken.
Finish and serve. Drizzle with yogurt-lime sauce.
Add cilantro, a squeeze of lime, and any extra toppings you like. Serve right away.