Rinse and drain the quinoa.
Add the quinoa to a medium sized saucepan with water/broth, cook at a medium high heat, bring this to a boil.
Turn the heat down to a low heat and cover for about 15 to 20 minutes or until all the liquid is completely absorbed.
Remove from the heat, and set aside.
Clean and dice the vegetables you are adding to the filling (peppers, minced garlic, and onion).
If adding corn, add frozen or fresh corn to the skillet with the other vegetables.
Add the vegetables and oil to a medium/large sized skillet.
Saute on a medium high heat until everything has slightly browned.
Preheat the oven to 425 ° F.
Prepare a baking sheet with parchment paper and set aside.
Next add the salsa, the extra oil, (can add beans at this time, optional) and the seasonings to the cooked quinoa.
Continue by adding the sauteed vegetables to the cooked quinoa.
Stir until everything is blended well.
Pour the filling onto the lined baking sheet and place into the oven.
Bake for 25 minutes, remove from the oven, stir and return to bake for a additional 25 minutes or until the filling is crumbly and slightly dry.
If the filling is still a little too wet/moist, return to the oven and bake for another 5 to 10 minutes, checking every 10 minutes until it is to your liking.
Once the filling is done, remove from the oven and serve.