
Prepare the Couscous: Cook couscous according to package directions. Fluff with a fork and set aside.
Sauté Aromatics: In a large skillet, heat olive oil over medium heat. Add sliced onions and cook until softened and translucent, about 5 minutes. Add minced garlic and cook for another minute until fragrant.
Cook Sausage: Add sliced Italian sausage to the skillet and cook until browned on all sides. Remove the sausage from the skillet and set aside.
Sauté Peppers: Add sliced bell peppers to the skillet and cook until slightly softened, about 8-10 minutes.
Combine and Simmer: Return the sausage to the skillet with the peppers. Add crushed tomatoes, tomato paste, Italian seasoning, salt, and pepper. Stir well to combine.
Simmer: Bring the sauce to a simmer, then reduce heat and cover. Cook for 20-25 minutes, stirring occasionally, until the sauce has thickened slightly and the flavors have melded.
Serve: Spoon couscous onto plates and top with the sausage and pepper mixture. Garnish with fresh parsley and a drizzle of olive oil. Serve immediately.