Bake the Chicken: Preheat oven to 400°F (200°C). Rub the chicken breasts with 1 tbsp olive oil, oregano, garlic powder, salt, and pepper. Bake for 15-18 minutes or until the internal temperature reaches 165°F (74°C). Let rest for a few minutes, then chop into bite-sized pieces.
Assemble the Salad: In a large bowl, combine chopped romaine, cherry tomatoes, white beans, and red onion.
Make the Dressing: In a small bowl, whisk together 1 tbsp olive oil, balsamic vinegar, salt, and pepper.
Serve: Toss the salad with the dressing, then top with chopped chicken and Parmesan cheese.