Season the chicken breast with a pinch of salt and pepper.
In a small bowl, mix the lemon juice, minced garlic, and a drizzle of olive oil to create a marinade.
Coat the chicken breast with the marinade and let it rest for about 10 minutes.
Heat a non-stick skillet over medium heat with the remaining olive oil.
Cook the chicken breast for 5-6 minutes on each side, or until it reaches an internal temperature of 165°F and is nicely browned.
Remove the chicken from the skillet and set aside to rest.
In the same skillet, add the sliced mushrooms and sauté for 2-3 minutes until they begin to soften.
Add the fresh spinach and sauté for an additional 1-2 minutes until wilted, stirring frequently.
Season the spinach and mushrooms with a little salt and pepper.
Slice the chicken, serve it alongside the sautéed spinach and mushrooms, and enjoy your balanced, zesty meal.