Brazilian Cheese Bread Rolls (Pão de Queijo)

From "The How Can It Be Gluten Free Cookbook" From America's Test Kitchen

Ingredients:

2 Cups Tapioca Starch/Flour
1 Cup Extra-Sharp Cheddar Cheese, Grated
1 Cup Parmesan, Grated
2/3 Cup Milk
1/3 Cup Olive Oil
2 Large Eggs
1 tsp Salt

Directions:

Adjust oven rack to middle position and preheat oven to 375 degrees. Spray a 24-cup mini cupcake tin with vegetable oil spray. Process all ingredients together in a blender until smooth, about 1 minute. Scrape the sides of the blender as needed. Pour batter, about 2 Tbsp per cup, into cupcake tin. The cups will be almost filled. Bake until lightly golden and puffed, 17-20 minutes, rotating halfway through. Cool rolls in muffin tin, on a wire rack, for 3 minutes. Serve warm. Store at room temperature and heat up in microwave or oven before eating.