Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Cut the chicken breast into 1-inch cubes and slice the yellow squash into half-moons.
In a small bowl, whisk together the olive oil, minced garlic, dried oregano, sea salt, and black pepper.
Place the chicken and squash on the baking sheet, pour the herb oil over them, and toss until everything is evenly coated.
Roast in the oven for 20 to 25 minutes, or until the chicken is cooked through and the squash is golden and tender.
While the chicken roasts, prepare the quinoa according to package directions if not already cooked.
Divide the fluffy quinoa into bowls and top with the roasted chicken and squash.
Garnish with fresh parsley and a bright squeeze of lemon juice before serving.