Heat oil in a large skillet over medium heat; cook and stir sausage until browned, about 5 minutes. Add onion to sausage; cook and stir until slightly browned, about 5 minutes. Stir sweet pepper, oregano, thyme, cayenne pepper, celery salt, and red pepper flakes into sausage mixture; cook and stir until fragrant, 1 to 2 minutes.
Mix quinoa into sausage mixture; cook and stir until quinoa is slightly toasted, about 1 minute. Pour broth and marinara sauce over quinoa mixture. Cover skillet and simmer until quinoa is tender, about 15 minutes.
Feel free to add shrimp, diced chicken, or sub in extra veggies.
Add more or less cayenne for your heat preference, or drizzle with Sriracha for a real kick in the pants.
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