Creating your Grilled Chicken Salad with Spinach and Mushrooms can be a straightforward process by following these simple steps:

1. Prepare the Chicken: Season the chicken breasts with garlic powder, salt, and pepper. Drizzle olive oil over them.

2. Preheat the Grill: Heat your grill or grill pan over medium-high heat.

3. Grill the Chicken: Place the seasoned chicken breasts on the grill. Cook for 6-8 minutes on each side, or until fully cooked. Ensure the internal temperature reaches 165°F (75°C).

4. Slice the Chicken: Once cooked, remove the chicken from the grill and let it rest for a few minutes. Then, slice it into thin strips.

5. Sauté the Mushrooms: In a skillet over medium heat, add a little olive oil. Sauté the sliced mushrooms for about 5 minutes until softened and slightly browned. Season with salt and pepper.

6. Combine Ingredients: In a large bowl, combine the spinach, sautéed mushrooms, cherry tomatoes, and grilled chicken slices.

7. Dress the Salad: Drizzle the balsamic vinegar over the salad mixture and toss gently to coat all ingredients evenly.

8. Add Feta Cheese: If desired, sprinkle crumbled feta cheese on top for an additional flavor boost.

9. Garnish: Finish with fresh parsley to add a pop of color and flavor.

10. Serve Immediately: Enjoy your fresh and delicious grilled chicken salad!