Season the chicken breast with a pinch of salt, black pepper, and dried oregano.
Grill the chicken over medium-high heat for approximately 6-7 minutes per side until the internal temperature reaches 165°F.
While the chicken is grilling, prepare the quinoa according to package instructions if not already cooked, and set aside to cool.
Dice the cucumber and red bell pepper into small, uniform cubes to ensure a consistent crunch in every bite.
In a small bowl, whisk together the extra virgin olive oil and lemon juice to create a simple, clean dressing.
In a large mixing bowl, combine the cooled quinoa, diced cucumber, and red bell pepper.
Pour the dressing over the quinoa mixture and toss well to coat all ingredients evenly.
Slice the grilled chicken into thin strips and arrange them over the top of the quinoa salad.
Garnish the dish with the pumpkin seeds for an extra layer of texture and healthy fats.