Bring a large pot of salted water to a boil. Add 2 cups of cheese tortellini and cook according to package instructions, usually about 3 to 5 minutes until they float to the surface. Drain the tortellini and set aside while you prepare the sauce.
Heat 1 tablespoon of olive oil in a large skillet over medium heat. Add the minced garlic and sauté for about 1 minute, stirring frequently to prevent burning. The goal is to release the garlic’s aroma without browning it.
Pour in the entire can of diced tomatoes with their juices. Stir in 1 teaspoon of dried basil. Let the mixture simmer for 5 to 7 minutes, allowing the tomatoes to break down slightly and the flavors to meld. Stir occasionally.
Reduce the heat to low and slowly add 1 cup of heavy cream to the skillet. Stir to combine, creating a rich, velvety sauce. Simmer for another 3 to 5 minutes, allowing the sauce to thicken slightly. Season with salt and pepper to taste.
Add the cooked tortellini directly into the skillet with the creamy tomato basil sauce. Gently toss to coat each piece in the sauce, making sure the tortellini is heated through.
Sprinkle 1/2 cup of grated Parmesan cheese over the tortellini and stir just until melted and incorporated. Garnish with fresh basil leaves before serving for a burst of color and fresh flavor.