Preheat oven to 375° F. Place pizza stone in the oven to heat.
Combine quinoa and broth in large saucepan. Bring to boil, reduce heat to low, cover and cook for 20 minutes without stirring.
Place broccoli, mushrooms, peppers and garlic cloves in a large bowl. Add olive oil and mix well. Place on heated pizza stone, add Kosher salt and roast in preheated oven for 15-20 minutes.
Add roasted vegetables to quinoa and mix over medium heat, slowly adding the Parmesan cheese.