How to Make It
Heat oil in a Dutch oven over medium. Add leeks; cook, stirring often, until tender, about 5 minutes. Add quinoa; cook, stirring constantly, until toasted, about 3 minutes. Add water, salt, squash, thyme, bay leaf, and pepper. Increase heat to high; bring to a boil. Cover and reduce heat to medium-low; cook until squash is very tender, about 15 minutes. Discard thyme and bay leaf.
Pour squash mixture into a blender; add 1/2 cup yogurt. Remove center piece of blender lid (to allow steam to escape); secure lid on blender. Place a clean towel over opening in lid. Process until smooth. Ladle soup into bowls; top with remaining yogurt and almonds. If desired, sprinkle with parsley.