Preheat oven to 400°F.
Add rinsed quinoa to a 9”x13” baking dish.
Add oregano through cayenne to the quinoa.
Mix tomato paste into the chicken broth and then pour over the quinoa and spices, stirring to combine.
Add the vegetables in layers on top of the quinoa, ensuring even layers, but do not stir (you want to make sure all of the quinoa remains submerged). Layer vegetables in this order: onion and garlic, celery, bell peppers, zucchini, tomato.
Spread the sausage coins on top of the tomatoes in an even layer.
Cover the baking dish with aluminum foil (shiny side down). Carefully place in the oven and allow to bake for 75 minutes. If you need to prepare the shrimp, do so while the rest of the dish is in the oven.
At the end of the 75 minutes of baking time, take out the dish, remove the aluminum foil, add the shrimp in an even layer over the top. Put back in the oven uncovered for an additional 15 minutes to allow extra liquid to evaporate and shrimp to cook.
Serve hot.