Preheat the grill over medium high heat to approximately 400 degrees F. In a small bowl, combine 1/2 teaspoon salt, 1/2 teaspoon pepper, and 1/2 teaspoon garlic powder. Brush 2 chicken breasts with 1 tablespoon olive oil and sprinkle the seasoning mixture evenly over both chicken breasts.
Place the chicken directly on the grill grates and grill the chicken for 3-5 minutes on each side until the chicken reaches an internal temperature of 165 degrees F.
Move the chicken to a separate plate to rest for at least 5 minutes.
In a small mixing bowl, whisk together 1/2 cup olive oil, 1/2 cup red wine vinegar, 1/2 teaspoon salt, 1/4 teaspoon black pepper, and 1/2 teaspoon dried oregano until combined.
Slice the chicken and cut the kernels from 1 grilled corn on the cob. Divide 4 cups chopped romaine lettuce among 4 serving bowls, then top with the sliced chicken, 2 cups chopped cherry tomatoes, the corn kernels, 1/2 cup sliced red onion, and 1 sliced avocado. Drizzle the dressing over each salad.
Serve immediately and enjoy!
Notes
You can easily make this salad with your favorite salad toppings or salad dressing.