In a large pot, bring salted water to a boil. Add the tortellini and cook according to package instructions, usually about 3-5 minutes for fresh and 7-9 minutes for frozen. Drain and set aside.
In a large skillet over medium heat, add olive oil. Once hot, add minced garlic and sauté for about 1 minute until fragrant, being careful not to burn it.
Stir in the chopped spinach and red pepper flakes (if using). Cook for about 2-3 minutes until the spinach has wilted down.
Lower the heat and pour in the heavy cream. Stir to combine, then gradually add the grated Parmesan cheese, mixing until melted and creamy. Season with salt and black pepper to taste.
Add the cooked tortellini into the skillet and gently toss until well coated in the creamy sauce. Cook for an additional 1-2 minutes to heat through.
Remove from heat and serve hot, garnished with fresh basil leaves for an aromatic touch.
Notes
Feel free to adjust the amount of red pepper flakes based on your spice preference.