Boil spaghetti in salted water until al dente, reserving 0.5 cup pasta water.
Fry chopped bacon in a skillet over medium heat until crispy.
Whisk eggs and parmesan cheese together in a bowl.
Toss hot drained pasta with cooked bacon, then remove skillet from heat.
Quickly stir in egg mixture and reserved pasta water to create a creamy coating.