In a large pot of boiling salted water, cook the cheese tortellini according to package instructions until al dente. Drain and set aside.
In a mixing bowl, combine the chopped spinach, ricotta cheese, grated Parmesan cheese, softened cream cheese, garlic powder, salt, pepper, and crushed red pepper flakes (if using). Mix until well combined and creamy.
Carefully open each tortellini and spoon about a teaspoon of the creamy spinach mixture into the center of each. Gently press to close the tortellini securely.
In a large skillet, heat the olive oil over medium heat. Add the stuffed tortellini in a single layer and cook for about 3-4 minutes, flipping gently until they are heated through and slightly golden on the outside.
Transfer the creamy spinach stuffed tortellini to a serving platter. Drizzle with a little olive oil and garnish with fresh basil leaves. Serve immediately, and enjoy!