Preheat oven to 375 degrees. Cook bacon in a
10-inch cast iron skillet until crisp. Remove
it with a slotted spoon and set aside.
Drain off all but 2 tablespoons of bacon
grease. Add onion to skillet and cook until
soft, about 5 minutes.
Stir in flour and cook for 2 minutes. Gradually
whisk in milk. Stir in salt, pepper, thyme,
nutmeg, cayenne pepper, and bourbon.
Simmer for about 3 minutes, or until slightly
thickened. Reduce heat to low and gradually
whisk in Gouda cheese and 2 cups of cheddar
Stir in cooked pasta and half of bacon.
Sprinkle remaining bacon and cheddar cheese on
Bake for 15 to 18 minutes.