In a large bowl, whisk together 1 tbsp olive oil, lemon juice, minced garlic, oregano, salt, and pepper.
Add chicken cubes to the marinade, coat thoroughly, and refrigerate for 15 minutes.
Preheat oven to 400 degrees Fahrenheit and toss sweet potato cubes with remaining olive oil on a baking sheet.
Roast sweet potatoes for 20 to 25 minutes until tender.
Preheat grill to medium-high heat and grill chicken for 8 to 10 minutes until the internal temperature reaches 165 degrees Fahrenheit.
Steam broccoli florets for 4 to 6 minutes until tender-crisp.
Apportion the quinoa, roasted sweet potatoes, broccoli, and chicken into four meal prep containers.