In a saucepan, bring the quinoa and 1 cup (may vary) of water to a boil, reduce the heat to low, cover and cook until the liquid is absorbed, around 20 minutes.
In a large bowl, combine the spinach, chopped red bell pepper, red onion, tomatoes, avocado, and cooled quinoa.
Make the dressing: combine olive oil, dijon mustard, balsamic, honey, salt, and pepper. Pour onto the salad.