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Melt the butterĀ in a large pot over medium-high heat and add the olive oil
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Add the diced onion and cook, stirring frequently until the pieces become transparent.
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Add the potatoes and stir to combine. Cook for another 3 minutes, stirring.
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Add the broth to the pot. Bring to a boil.
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Turn the heat down to low and let it simmer for 20-25 minutes until the potato pieces are tender.
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Stir in the turmeric, garlic powder, sugar, and rosemary.
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Let simmer for another 5 minutes.
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Use a stick blender to puree the soup. I half-pureed this batch. I wanted to leave some potato pieces intact for extra heft.
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Season with kosher salt and freshly ground pepper to taste.
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Add more sugar a pinch at a time if needed.
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Remove from heat and serve.