This creamy root vegetable soup is perfect for a chilly, winter day. Root vegetables simmer in a fragrant broth before being pureed into a velvety, delicious soup. Ready in 35 minutes or less!
Melt the butter in a large pot over medium-high heat. Add the onion, carrots, and celery; stir to coat with the melted butter. Sprinkle with salt and add red pepper flakes. Saute the vegetables until they begin to soften; about 5 minutes.
Stir in the yam, potatoes, garlic, ginger, and thyme. Pour in the stock and bring to a boil. Reduce heat to maintain a simmer and cover. Cook until the potatoes are soft; about 15 minutes.
Remove the soup from the heat and discard the thyme. Puree soup in batches in a blender until smooth. Or use an immersion blender in the pot. A food mill works great too.
Stir in the cream, taste for seasoning and serve warm.