Preheat oven to 400°F (200°C).
Place chicken breasts on a rimmed baking sheet, season with salt and pepper, and roast for 20-25 minutes until the internal temperature reaches 165°F (74°C).
In a medium saucepan, combine quinoa and chicken broth; bring to a boil, then cover and simmer on low for 15 minutes until liquid is absorbed.
On a separate baking sheet, toss broccoli florets with olive oil and garlic powder; roast for 15 minutes until edges are charred.
Transfer cooked chicken to a bowl and shred using two forks or a hand mixer.
In a small bowl, whisk buffalo sauce and Greek yogurt until smooth, then fold into the shredded chicken.
Sauté the cauliflower rice in a pan over medium heat for 5-7 minutes until moisture evaporates.
Divide the quinoa, cauliflower rice, roasted broccoli, and buffalo chicken equally among four meal prep containers.
Top with blue cheese crumbles and sliced green onions before sealing.