Prep the ingredients for the quinoa skillet dish before starting to cook, and set aside 1/4 cup of the diced onion for the Pico de Gallo.
Preheat a large skillet (13"-15") over medium high heat. When the pan is hot but not smoking, add the oil along with the zucchini, bell pepper, onion, and garlic. Sauté stirring often until the veggies have softened but are still crisp tender, about 5 minutes.
When the veggies have softened, add the cumin and chili powder to the skillet, and stir to mix in. Then add the black beans, quinoa, fire roasted tomatoes, and vegetables stock. Stir to combine and cover the skillet with a lid. Bring the mixture to a boil, then lower the heat to maintain a simmer. Cook stirring occasionally until all the liquid has absorbed, and the quinoa is fluffy, 20-25 minutes.
While the quinoa is cooking, mix together the ingredients for the Pico de Gallo. Season to taste with salt, and set aside to let the flavors blend.
Stir together all the ingredients for the Avocado Lime Cabbage Slaw, then set it aside until the serving time.
When the quinoa is done, add the corn and stir to combine. Season to taste with salt, and serve immediately with Pico de Gallo and the Avocado Lime Cabbage Slaw as toppings.