Creating the Best-Ever Chicken Carbonara is a straightforward process if you follow these detailed steps:

1. Cook Pasta: Bring a large pot of salted water to a boil. Add the spaghetti or fettuccine and cook according to package instructions until al dente. Reserve 1 cup of pasta water, then drain pasta and set aside.
2. Cook Chicken: In a large skillet, heat olive oil over medium heat. Add the diced chicken, seasoning with salt and pepper. Cook until browned and cooked through, about 6-8 minutes. Remove chicken from skillet and set aside.
3. Cook Pancetta: In the same skillet, add the pancetta or bacon, cooking until crispy, about 3-5 minutes. Add minced garlic and sauté for an additional minute, ensuring it does not burn.
4. Prepare Sauce: In a medium bowl, whisk eggs and Parmesan cheese together until combined. Add the heavy cream and mix well.
5. Combine Ingredients: Reduce heat to low. Add the drained pasta to the skillet with pancetta and garlic, tossing to combine. Quickly pour the egg and cheese mixture over the hot pasta, stirring continuously to create a creamy sauce. If the sauce is too thick, add reserved pasta water a little at a time until desired consistency is reached.
6. Add Chicken: Return the cooked chicken to the skillet, mixing thoroughly to combine all ingredients and heat through.
7. Season and Serve: Taste and adjust seasoning with additional salt and pepper if needed. Garnish with chopped parsley.
8. Plating: Serve immediately while warm, ensuring each plate gets a generous helping of the creamy carbonara sauce.

By carefully following these steps, you will create an impressive Best-Ever Chicken Carbonara that is sure to delight everyone at the table.