While the quinoa is cooking, season and cook your veggies. Add the asparagus, corn, and mushroom to a sheet pan. Make sure not to overcrowd the sheet pan and use a second pan if needed. Next, season with the oil, garlic powder, red chili pepper flakes, salt, and pepper. Mix to coat the veggies and bake for 20-25 minutes until beginning to brown and crisp. Remove and set aside.