Rinse quinoa under cold water.
Add quinoa and water to a pot and bring to a boil.
Lower heat, cover, and cook for 15 minutes.
Turn off heat and let sit for 5 minutes. Fluff with a fork.
Mix olive oil, lemon juice, and salt into the quinoa.
Heat olive oil in a pan over medium-high heat.
Add garlic and cook for 20 seconds.
Add shrimp in one layer.
Season with paprika, oregano, salt, pepper, and lemon zest.
Cook shrimp for about 2 minutes per side until pink.
Divide quinoa into bowls.
Top with shrimp, vegetables, olives, and herbs.
Add feta and chili flakes if using.
Serve warm.