In a large pot over medium-high heat, add diced bacon and cook until it turns crispy and golden-brown, about 5–7 minutes. Transfer the bacon to a paper towel-lined plate to drain excess fat, leaving the flavorful drippings in the pot.

Reduce the heat to medium and add diced onions to the pot, cooking them until softened and translucent, approximately 3 minutes. Stir in the shredded carrot and minced garlic, allowing them to sauté until fragrant, about 1 minute.

Pour in the chicken broth, followed by brown sugar, bay leaf, thyme, salt, pepper, and ground nutmeg. Stir well to combine and bring the mixture to a rolling boil. Cover and reduce the heat to a simmer for 15 minutes.

Add the pumpkin puree and heavy whipping cream to the pot, stirring to combine. Let the soup simmer for an additional 2–3 minutes.

Remove the bay leaf and thyme sprigs. Using an immersion blender, blend the soup until it reaches a smooth, velvety consistency.

Stir in a tablespoon of freshly chopped parsley, ladle into bowls, and garnish with a drizzle of cream, croutons, and crispy crumbled bacon.