Bring a large pot of salted water to a boil. Add the cheese tortellini and cook according to package instructions, about 3-5 minutes, until al dente. Drain and cool slightly.

In a large skillet over medium heat, melt 4 tablespoons of butter, swirling regularly until bubbly but not browned.

Add the cooked tortellini to the skillet and gently toss for 2-3 minutes until evenly coated and warmed.

Carefully transfer the buttery tortellini onto a serving platter with a slotted spoon.

Sprinkle with Parmesan cheese, if desired, and serve immediately with marinara sauce on the side.