In a large dutch oven, fry the bacon until golden brown and crispy.
Remove bacon to paper towel and allow to cool; then chop it into bits and set aside.
Remove the bacon fat from the pot, leaving about 2 Tbsp, including bacon bits.
Melt the butter in same pot as the bacon grease over medium heat.
Add celery, leeks, and onion, sautéing until translucent. Stir in garlic, and saute another 30-60 seconds.
Add chopped potatoes, clam juice, broth, clams (keep the liquid), pepper, onion powder, thyme, and dill. Cover and bring to a simmer over medium heat, cooking until potatoes are tender.
Combine cornstarch with cream or half and half in a measuring cup and whisk until cornstarch is fully dissolved. Reduce heat to medium-low and slowly pour it into the chowder while stirring. Add in the crumbled bacon (reserve a few bacon bits for garnish at the end) and continue to cook until it returns to a simmer and thickens.
Prepare the bread bowls:
Meanwhile, while the chowder is cooking, hollow out the bread bowls. Cut the tops off about ¼ of the way from the top, then cut the centers out, leaving a 1 inch rim and bottom of bread.
TIP: Brush the inside of the bowl with oil (avocado or olive oil) and bake at 450°F for 6-8 min until slightly golden. This will prevent the bread from getting soggy.
Once the chowder is thick, season to taste for salt and pepper.
For serving, ladle it into the bread bowls and top with extra bacon bits, a sprinkle of dill, and a sprinkle of fresh chopped parsley to garnish.