First, make the maple mustard dressing. In a small bowl or jar, whisk together the olive oil, lemon juice, apple cider vinegar, maple syrup, mustard, garlic, salt, and pepper. Set aside.
In a large bowl, add the spinach, cooked quinoa, apples, dried cranberries, goat cheese, and walnuts. Toss until salad is combined. Season with salt and black pepper, to taste.
Drizzle with dressing and toss again. Serve and enjoy!