Chef John's Brazilian Cheese Bread (Pao de Queijo)
Ingredients:
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2 ¼ cups tapioca flour, or more as needed
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⅔ cup milk
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½ cup mild olive oil
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1 teaspoon kosher salt
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2 ounces freshly grated mozzarella cheese
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2 ounces finely grated Parmigiano-Reggiano cheese
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2 large eggs, beaten
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1 pinch cayenne pepper