01 - 
                Bring a large pot of salted water to a boil. Add tortellini and cook according to package instructions until al dente. Reserve 1/4 cup of pasta water, then drain.
              
              
              
                02 - 
                In a medium bowl, whisk together eggs and grated parmesan cheese until smooth. Set aside.
              
              
              
                03 - 
                In a large skillet over medium heat, cook diced pancetta or bacon until crispy, about 5–7 minutes. Add minced garlic during the last minute, if desired. Remove skillet from heat.
              
              
              
                04 - 
                Add drained tortellini to the skillet with pancetta. Pour the egg and cheese mixture over the tortellini, stirring constantly to create a creamy sauce. Gradually add reserved pasta water until desired sauce consistency is achieved.
              
              
              
                05 - 
                Season with freshly ground black pepper and adjust salt to taste. Garnish with additional parmesan cheese and fresh parsley. Serve immediately.