In a large bowl, combine spinach, quinoa, avocado, berries, walnuts, pumpkin seeds, chili (if using), and chia seeds.
In a jar, whisk tahini, lemon juice, vinegar, maple syrup, garlic, and ginger. Add water gradually until creamy.
Season with salt and pepper, then drizzle over the salad.
Toss gently and serve immediately.