Step 1: Cook the Quinoa: Rinse the quinoa under cold water. In a large pot, combine quinoa with 3 cups of water and a pinch of salt. Bring to a boil, then simmer, cover, and cook for about 15 minutes until fluffy. Let sit covered for 5 minutes.
Step 2: Prepare the Chicken: Season chicken with oregano, salt, and pepper. Heat 2 Tbsp olive oil in a skillet. Cook chicken for 6-7 minutes on each side until fully cooked and golden brown. Let rest before slicing.
Step 3: Chop the Veggies: Chop red bell pepper, cucumber, tomatoes, red onion, and avocado into bite-sized pieces.
Step 4: Assemble the Bowls: Fluff quinoa and divide among serving bowls. Top with chicken, veggies, avocado, and feta. Add tzatziki and hummus, then drizzle with lemon juice and garnish with parsley.