Rinse quinoa under cold water. Cook 1 cup quinoa in 2 cups water. Cover, simmer 15 minutes. Fluff with fork, let cool.
Place chopped kale in a big bowl. Drizzle with 1 teaspoon olive oil and a pinch of salt. Massage with your hands for 2–3 minutes until softened.
In a jar, mix olive oil, lemon juice, garlic, Dijon, salt, and pepper. Shake well to make the dressing.
In a large bowl, add kale, quinoa, onion, tomatoes, cucumber, and seeds. Toss with half the dressing.
Gently fold in avocado slices and feta. Drizzle the rest of the dressing on top. Serve fresh.