Step 1Cut the bacon in thin slices crosswise and combine with the minced shallot in a medium pot. Place over medium heat and cook just until the shallot softens and the bacon frizzles (you don't want it to render completely, just begin cooking) about 5 minutes.
Step 2Add the potatoes and stir to combine the flavors. Add the milk, half-and-half and bay leaf and bring to a simmer. Cook, maintaining a moderate simmer, until the potatoes are quite tender, about 20-25 minutes.
Step 3Remove the bay leaf. Add the halibut and the salt and cook until the halibut is firm, about 4-5 minutes.
Step 4Remove the pan from the heat and stir in the sugar snap peas, chives and chervil. Taste and add more salt if necessary. Serve immediately into heated bowls.