Cook the rice according to package directions if you don't already have cooked rice.
Cut the chicken breast into small bite-sized pieces.
Season the chicken with taco seasoning, garlic powder, salt, and black pepper.
Heat olive oil in a large skillet over medium-high heat.
Add the chicken and cook for 6–8 minutes, stirring occasionally, until fully cooked and lightly browned.
While the chicken cooks, warm the black beans and corn separately.
In a small bowl, mix Greek yogurt, salsa, lime juice, and garlic powder.
Divide the cooked rice between four bowls.
Add the seasoned chicken, black beans, and corn.
Top with lettuce, diced tomatoes, and salsa.
Drizzle with the Greek yogurt sauce.
Add cilantro, jalapeños, hot sauce, or extra lime if desired.
Serve warm.