Season the chicken: In a bowl, combine chili powder, smoked paprika, cumin, garlic powder, onion powder, salt, pepper, olive oil, and lime zest/juice.
Toss chicken to coat. Let sit 15–30 minutes (or up to 8 hours in the fridge).
Cook the corn: Heat a large skillet over medium-high. Add a little oil.
Spread corn in an even layer and let it char undisturbed for 2–3 minutes. Stir and repeat until you see browned spots. Season with a pinch of salt.
Transfer to a bowl to cool slightly.
Sear the chicken: In the same skillet, add a bit more oil. Cook chicken 5–6 minutes per side, until browned and cooked through (internal temp 165°F/74°C). Rest 5 minutes, then slice or dice.
Make the yogurt-lime sauce: Stir Greek yogurt, mayonnaise (if using), lime juice, garlic, chili powder, and salt until smooth.
Adjust lime and salt to taste.
Mix the street corn: To the charred corn, add red onion, jalapeño, cilantro, and cotija. Squeeze in a little lime if you like. Toss gently.
Prep the base: Warm cooked rice or quinoa; or layer chopped romaine in bowls if going salad-style.
For extra flavor, squeeze a little lime and sprinkle a pinch of salt over your base.
Assemble: Divide base among bowls. Top with chicken, a generous scoop of street corn mix, and spoonfuls of yogurt-lime sauce.
Finish: Add avocado, hot sauce, extra cilantro, and lime wedges. Serve warm or at room temp.