Bring a large pot of salted water to a boil. Add the 12 ounces of cheese tortellini and cook according to the package directions until al dente, usually about 3 to 5 minutes. Once cooked, reserve about 1/4 cup of the pasta water, then drain the tortellini and set aside.
In a large skillet, heat 1 tablespoon of olive oil over medium heat. Add the minced garlic and sauté until fragrant, about 30 seconds to 1 minute. Be careful not to burn it. Then add the chopped sun-dried tomatoes and cook for another 2 minutes to release their intense flavor.
Pour in 1 cup of heavy cream and stir well to combine. Let the cream come to a gentle simmer, stirring occasionally. This will thicken the sauce slightly and allow the flavors to marry beautifully.
Add the cooked tortellini to the skillet along with 1 cup of fresh spinach. Toss gently to coat the pasta and wilt the spinach in the warm sauce, about 1 to 2 minutes.
Sprinkle 1/2 cup of grated Parmesan cheese into the skillet, stirring until melted and integrated into the sauce. If the sauce seems too thick, add a splash of the reserved pasta water to loosen it. Season with salt and pepper to taste.
Scoop the creamy sun-dried tomato tortellini into bowls and garnish with extra Parmesan or fresh herbs if you like. This dish pairs perfectly with a crisp green salad or garlic bread for a complete meal.