Boil water in a large pot and cook the rotini pasta according to package instructions until al dente.
In a large skillet, heat olive oil over medium heat.
Add sliced onions and garlic, sautéing until translucent.
Add the sliced bell peppers, cooking until they soften.
Stir in paprika and thyme, mixing well.
Pour in the heavy cream, bringing it to a gentle simmer.
Season the sauce with salt and pepper to taste.
Drain the cooked pasta and add it to the skillet.
Toss the pasta in the sauce until well coated.
Serve immediately, garnished with fresh herbs if desired.