In a pot of boiling water, cook the quinoa according to the instructions on the package. Once cooked, drain any excess water if needed and cover with a lid to keep warm. Season with salt to taste.
In a bowl, mix the chicken with paprika, garlic powder, salt and pepper.
Heat a nonstick pan over medium heat. Once hot, add the oil, chicken, and onions to the pan. Saute to brown the chicken on all sides. Add in the garlic and tomatoes. Season with salt and pepper. Continue to saute until the chicken reaches an internal temperature of 160 degrees. Add in the spinach and cook until wilted. Remove from the heat and toss in the quinoa.
In a blender or food processor blend together the ingredients for the dressing until smooth. Taste and adjust the ingredients if needed. Season with salt and pepper to taste.
Portion the quinoa, drizzle with sauce and top with feta. Serve with bread.