Cook the bacon over medium-high heat in a skillet until crisp. Remove the bacon from the pan and drain on paper towels.
Turn the heat down to low and remove all but 1 Tbsp bacon grease from the pan and add in the butter and the garlic. Cook for about 2 minutes. Remove from heat and set aside.
Whisk the eggs, miso and parmesan cheese in a large bowl until well combined and smooth.
Cook the udon noodles according to package directions, reserving 1/2 cup cooking water.
Drain the noodles, immediately add them to the egg/cheese mixture and toss quickly and thoroughly until a thick sauce forms. Add pasta water only if it needs thinning.
Season with S&P and add in the cooked bacon.
Top with sliced scallions, red pepper flakes and drizzle the garlic butter over all.
Keyword Creamy Udon Carbonara with Miso and Garlic