Rich, creamy Christmas Eve clam chowder is a high protein, seafood family tradition for the holiday feast. This warming, comforting soup is a beloved part of seasonal celebrations.
In a large pot over medium heat, cook chopped bacon until crisp. Remove bacon and set aside, leaving 2 tbsp fat in the pot.
Add butter to the bacon fat. Stir in onions and celery, sautéing over medium-low heat until softened but not browned, about 5 minutes.
Sprinkle flour over vegetables and cook, stirring constantly, for 2 minutes to form a smooth roux with no dry spots.
Gradually whisk in clam juice (from clams) and add diced potatoes and bay leaf. Bring to a gentle simmer, cover, and cook until potatoes are just tender, 10–12 minutes.
Reduce heat to low. Stir in clams, whole milk, and heavy cream; season with salt and black pepper. Simmer without boiling for 6–8 minutes to meld flavors and prevent curdling.
Remove the bay leaf. Adjust seasoning if needed. Ladle the chowder into bowls and garnish with reserved bacon and fresh parsley.