In a large (7 qt) Dutch oven, melt the butter over medium-low heat. Add the onion and celery, and cook until slightly softened, about 2-3 minutes. Add the butternut squash and thyme leaves, cooking for about 8 more minutes, stirring occasionally. (It’s fine if the squash starts to brown a little.) Stir in the flour until fully incorporated.
1/3 cup butter, 1/2 of a large yellow onion, diced, 4 stalks celery, chopped, 1 (3-1/2 lbs.) butternut squash, peeled, seeded and cubed, 1 tbsp. fresh thyme leaves, 1 tbsp. all-purpose flour
Add the chicken broth and bring to a boil. Reduce the heat, cover, and simmer on low for another 10 minutes, until the squash is soft. Use a hand-held blender or regular blender to puree the squash mixture until smooth.
1 (14.5 oz.) cans low-sodium chicken broth
Add the soup back to the pot (if you removed it to put into a blender), then add the Boursin cheese, salt, and both peppers. (The soup should still be hot enough to melt the cheese, if it's not, use low heat to complete.) Stir until the cheese is fully melted.
2 (5.2 oz.) rounds Boursin cheese with Garlic and Fine Herbs, 2 tsps. kosher salt, 1 tsp. coarse ground black pepper, 1/2 tsp. white pepper
Garnish each bowl with crumbled bacon and chopped chives.
6 pieces cooked bacon, crumbled, 1 tbsp. chopped chives