Chef John's Brazilian Cheese Bread (Pao de Queijo)

Details

Ingredients

• 2 ¼ cups tapioca flour, or more as needed
• ⅔ cup milk
• ½ cup mild olive oil
• 1 teaspoon kosher salt
• 2 ounces freshly grated mozzarella cheese
• 2 ounces finely grated Parmigiano-Reggiano cheese
• 2 large eggs, beaten
• 1 pinch cayenne pepper