Special equipment: A deep-fry thermometer and plastic piping bags
Add the oil to a deep pot and heat it over medium-high heat until it registers 375 degrees F on a deep-fry thermometer. Set up a work surface with 4 or 5 plastic piping bags, scissors, tongs, parchment paper, and a wire rack with parchment paper underneath.
In a big bowl, whisk the flour, baking powder, salt, cinnamon, and granulated sugar. Add the eggs and milk and whisk well. Get all the lumps out!
Fill all the piping bags with batter. Cut the tip off one bag and drizzle the batter straight into the hot oil in a swirly, crazy pattern. Toss the piping bag. When one side is golden brown, about 75 seconds, carefully flip the funnel cake with tongs and fry the other side, another 75 seconds. Fry the rest of the batter.
Drain the funnel cakes on the wire rack. While they're still warm and shiny, dust them with powdered sugar using a wire-mesh strainer. Serve immediately!
"Duff Bakes: Think and Bake Like a Pro at Home" by Duff Goldman © William Morrow Cookbooks 2015. Provided courtesy of Duff Goldman. All rights reserved.