Wilted Greens Soup with Crème Fraîche

INGREDIENTS

4 tbsp

unsalted butter

1/2

onion, chopped

sprigs thyme, leaves picked

small Yukon Gold or 1/2 russet potato, peeled, cut into 1-inch pieces

4 cups

low-sodium chicken broth

4 cups

chopped mixed wilted greens (such as Boston, romaine, arugula, iceberg, red oak, and/or green oak)

1 1/2 cups

frozen peas, thawed

1 tsp

sugar

Kosher salt, freshly ground pepper

Crème fraîche and chopped fresh chives, tarragon, mint, and/or parsley (for serving)