Rinse the quinoa and cook according to the instructions on the package. Season with salt to taste, and cover to keep warm.
Grill the Chicken: Heat a grill or griddle pan to medium heat. Drizzle the chicken on both sides with olive oil, then season with paprika, garlic powder, salt, and black pepper. Grill the chicken for about 6 minutes per side, or until it reaches an internal temperature of 160°F (71°C). Let it rest for 3 minutes before slicing into bite-sized pieces.
Make the Sauce: In a blender, combine garlic, cilantro, cumin, olive oil, lemon juice, and Greek yogurt. Blend until smooth, adding a few droplets of water if needed to adjust consistency. Season with salt and pepper to taste.
Prepare the Korean Banana Milk: In a blender, combine banana, maple syrup, vanilla extract, milk, water, and ice cubes (if using). Blend until smooth, adjusting sweetness or consistency as needed.
Assemble the Buddha Bowl: Portion the quinoa. Top with grilled chicken, tomato, cucumber, avocado, feta cheese, and red onion. Drizzle with the prepared sauce.
Serve with a side of fresh blueberries and Korean banana milk.