Season shrimp with ½ teaspoon salt and ¼ teaspoon chili powder.
Saute shrimp in a skillet with 2 teaspoons of the olive oil over medium-high heat, about 3 minutes on each side. Remove the shrimp and set aside
Saute green onion in the skillet for about 2 minutes and then add garlic. Cook until fragrant, about 1 minute.
Add the quinoa, cayenne, and remaining salt, chili powder, cayenne pepper, and remaining oil. Stir to coat the quinoa with the oil and let brown for 2 minutes on medium-low heat.
Stir in the chicken stock and bring the broth to a boil. Reduce heat, cover and allow to simmer until the quinoa is tender, about 12-15 minutes. Uncover and fluff with a fork.
Stir in lemon juice and parsley.
Scoop quinoa onto a plate and top with shrimp. Garnish with fresh parsley.