Crisp the bacon in a Dutch oven over medium heat, 6–8 minutes; transfer to a plate.
Pour off excess fat, leaving about 2 tablespoons; melt the butter in the pot.
Soften onion and celery in the fat until translucent, about 5 minutes. Stir in garlic for 30 seconds.
Sprinkle in flour and cook, stirring, 2 minutes to remove raw taste.
Whisk in clam juice gradually until smooth; bring to a gentle simmer.
Add potatoes and thyme; simmer partially covered until potatoes are tender, 12–15 minutes.
Reduce heat to low; stir in milk and cream. Do not let it boil.
Fold in clams and most bacon; warm 2–3 minutes. Season with salt and pepper, then garnish with parsley.
Notes
For a thicker chowder, mash a few potato cubes in the pot or simmer a few minutes longer. Swap salt pork for bacon for a classic twist, or add a splash of dry sherry before the cream for depth. Leftovers keep 3 days refrigerated; reheat gently without boiling to avoid curdling.This recipe is an original creation inspired by classic Creamy New England Clam Chowder Recipe flavors. All ingredient ratios and instructions are independently developed.