Preheat your oven to 425°F.
In a shallow bowl, combine the lemon juice, a pinch of salt, pepper, and chopped parsley.
Marinate the chicken breast in the lemon herb mixture for at least 15 minutes to infuse flavor.
Meanwhile, prepare a coating station by placing the whole wheat panko on a plate.
After marination, lightly pat the chicken to remove excess moisture, then press both sides into the panko to create an even crispy coating.
Heat olive oil in an oven-safe skillet over medium-high heat. Sear the chicken for 2-3 minutes on each side until golden brown.
Transfer the skillet to the preheated oven and bake the chicken for 8-10 minutes or until the internal temperature reaches 165°F.
While the chicken is baking, combine sliced red onion and cucumber in a bowl.
Drizzle a small amount of extra lemon juice and season with salt and pepper over the salad for a refreshing finish.
Once the chicken is done, plate it alongside the fresh red onion and cucumber salad. Garnish with additional parsley if desired and serve immediately.