In a medium bowl, whisk together olive oil, lime juice, minced garlic, smoked paprika, cumin, salt, and pepper. Add the chicken breasts and turn to coat evenly. Cover and refrigerate for at least 20 minutes, or up to 2 hours.
Prepare brown rice or quinoa according to package instructions. Fluff with a fork when done and set aside to cool slightly.
Heat the grill or grill pan to medium-high heat. Cook the chicken for 5-6 minutes per side, or until the internal temperature reaches 165°F (74°C). Remove from heat and let rest for 5 minutes before slicing.
If using fresh corn, grill alongside the chicken for 8-10 minutes until lightly charred, then slice kernels off the cob. If using frozen corn, thaw and pat dry.
In a small bowl, whisk together Greek yogurt, olive oil, lime juice, cilantro, salt, and pepper until smooth and creamy.
Divide cooked grains into bowls or containers. Top with sliced grilled chicken, corn kernels, avocado slices, diced red onion (if using), and chopped cilantro.
Drizzle the cilantro-lime dressing over each bowl and finish with a squeeze of fresh lime juice. Serve immediately or refrigerate for meal prep.
Notes
Store these bowls in the refrigerator for 3-4 days. Keep avocado slices separate until ready to eat to maintain freshness.