01 -  In a large pot or Dutch oven, cook the bacon over medium heat until crispy. Remove with a slotted spoon and set aside, leaving the fat in the pot. 
 02 -  Add butter to the bacon fat, then sauté onion, celery, and garlic until soft (about 5 minutes). 
 03 -  Stir in the flour and cook for 1 minute, forming a light roux. 
 04 -  Slowly add reserved clam juice and bottled clam juice, stirring constantly to avoid lumps. 
 05 -  Add potatoes, bay leaf, thyme, white pepper, and a pinch of salt. Bring to a boil, then reduce heat and simmer for 15–20 minutes until potatoes are tender. 
 06 -  Stir in milk and cream, then add clams. Simmer gently for 5 more minutes. Do not boil after adding clams to prevent toughness. 
 07 -  Remove bay leaf. Adjust seasoning as needed. Serve hot, garnished with crispy bacon and optional oyster crackers.