Preheat oven to 400°F. Line a large baking pan with parchment paper or lightly coat with non-stick cooking spray. Set aside.
In a medium bowl, add cauliflower and mushrooms. Add olive oil, rosemary, thyme, garlic powder, salt, and pepper.
Toss to coat. Spread vegetables in an even layer on prepared baking pan.
Bake for 18-20 minutes, or until vegetables are tender, flipping halfway through.
As vegetables are cooking, prepare quinoa according to package directions, using chicken broth instead of water.