make the egg mixture
In a large baking dish combine milk, salt, cinnamon powder, and sugar. Beat with a whisk to combine.
soak the bread
Cut the baguette into 2 cm (1-inch) slices. Soak the bread slices in the prepared egg mixture. Set aside for 2 minutes, then turn the bread and leave to soak for another 2 minutes per side.
fry the french toast
Pour oil into a deep skillet and place over medium heat. Cook until the oil reaches 170 °C / 340 °F then carefully add the bread in a single layer. Deep-fry in two alternations. Deep-fry for 3 minutes, then turn the french toast and continue to fry for another 3 minutes. Transfer the French toast to a baking sheet lined with paper towels to get rid of any excess oil. Repeat the process with the rest of the oil.
coat in sugar and serve
Make the sugar coating. In a bowl combine sugar and cinnamon powder. Coat the warm French toast in cinnamon sugar and serve as soon as possible.