In a medium bowl, toss the chicken cubes with smoked paprika, garlic powder, salt, and pepper until evenly coated.
Heat olive oil in a large skillet over medium-high heat. Add the chicken and cook for 8 to 10 minutes, stirring occasionally, until the internal temperature reaches 165°F (74°C).
In a small mixing bowl, whisk together the Greek yogurt and ranch seasoning until smooth. If too thick, add a teaspoon of water or milk to reach desired consistency.
Prepare four serving bowls by placing 1/2 cup of cooked brown rice in each.
Evenly distribute the cooked chicken, black beans, roasted corn, and cherry tomatoes among the bowls.
Drizzle each bowl with 1 tablespoon of BBQ sauce and 2 tablespoons of the prepared Greek yogurt ranch.
Top with avocado slices and garnish with fresh parsley.