Combine eggs, milk, parmesan cheese and miso in a bowl and mix them until the miso dissolves completely.
Cook spaghetti in a pot of boiling salted water until al dente.
While boiling the spaghetti, cook bacon in a sauté pan for 4 minutes on medium heat and set aside.
Add hot, drained pasta to the sauté pan and cook on medium heat for 20 seconds.
Lower the heat; add the bacon and the cream mixture from Step 1 and mix well to cover pasta.
Serve with ground black pepper to taste.