In a medium-size saucepan, bring the 2 cups of water to a boil. Once at a boil, reduce to medium-low heat and add in the tri-colored quinoa and 1 tablespoon salt. Place a lid on the pot and simmer for 15 minutes. Once cooked, remove from the heat and set to the side.
While the quinoa cooks, preheat the grill to 500 degree's Fahrenheit.
While the grill preheats slice the bell peppers and onion and place in a bowl. Drizzle grapeseed oil on top and sprinkle with 1 tablespoon of the fajita seasoning. Mix with your hands and set to the side.
Place steaks on a plate, drizzle grapeseed oil on top and then sprinkle 1 tablespoon of fajita seasoning divided among the steaks and on each side.
Clean grill and reduce heat to low. Spray the grill with cooking spray to reduce sticking. Place peppers and onions in a veggie basket and place steaks on the grill. Grill the steaks for 5 minutes on each side, toss the veggies a few times to prevent burning. Remove from the grill and let the steaks rest for 5 minutes.
Slice steaks thinly. Divide the fresh spinach in each bowl, add the quinoa divided among 4 bowls, then top with pepper and onion mixture and steak slices. Top with fresh cilantro, sprinkle shredded cheddar cheese on top, and a dollop of sour cream. Squeeze lime on top and enjoy immediately.