- In a large pot, melt the butter over medium heat. 
- Add the minced garlic, chopped onion, celery, and carrots. 
- Sauté until the vegetables are tender. 
- Stir in the basil, oregano, and thyme to release their aroma. 
- Pour in the clam stock and bring the mixture to a boil. 
- Add the diced potatoes and simmer until they are tender. 
- Mix the all-purpose flour with a bit of the milk to form a smooth paste. 
- Gradually stir the paste into the pot to thicken the chowder. 
- Gently add the clams and simmer for a few more minutes. 
- Stir in the remaining milk. 
- Continue to cook until the chowder is thoroughly heated. 
- Serve hot.