Cook the Quinoa. Place quinoa in a small saucepan along with the salt and water. Bring mixture to a boil over medium-high heat. Lower heat to a simmer and cook covered for 15 minutes. Remove the pot from the heat. Allow the quinoa to rest in the saucepan for about 5 minutes, without opening the lid, to absorb all the liquid and steam. Uncover and fluff with a fork to separate the quinoa.
Roast the Vegetables. Preheat oven to 425°F. Place the vegetables on a rimmed 18 x 13-inch baking sheet. Drizzle olive oil and season with salt, pepper, garlic powder and oregano. Use your hands to toss the vegetables and spread out into an even layer. Roast until fork tender 30 minutes. Flip the vegetables and broil on high heat for another 5 minutes.
Divide the quinoa among four bowls. Add the roasted vegetables on top and sprinkle with fresh chopped parsley. Drizzle tahini sauce on top and enjoy immediately.
Storage: Keep it cool in the fridge and sealed in an airtight container and this should last for up to 5 days.