First of all cook the quinoa as per the instructions which is 1 cup quinoa with 2 cups of water. Once done fluff it up using a fork and let it cool down completely. Then refrigerate for about half hour.
To make the dressing, in a mason jar, add olive oil, cumin powder, salt, pepper, lime juice, vinegar, pressed garlic, and garlic powder. Put on the lid and shake it well. Set the dressing aside.
Rinse the black beans and corn well once taken out of the can. Take the quinoa out of the refrigerator. In a mixing bowl, add quinoa, black beans, both peppers, cilantro, onion, green onions, avocado if using. Mix everything together. Now add the dressing to the mixture and mix well again. Do a taste test to see if there is any salt needed. Add it at this time and mix it. You can refrigerate for a little bit before serving so the flavors can marry.
Your Mexican Quinoa Salad is ready to be served.