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In a soup pot set over medium-high heat, melt the butter with the oil.
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Once it sizzles, add the onion and chile and cook for 3 to 4 minutes, until completely wilted and beginning to brown.
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Add the corn and salt, stir, and cook for another 3 minutes. Add the cilantro and stir.
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Pour in the broth and bring to a simmer.
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Then cover, reduce the heat to low, and cook for 7 to 8 minutes. Turn off the heat.
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Pour the soup into bowls and serve hot. Top with queso.