Evenly spread the peanut butter on two slices of bread. Drizzle some condensed milk on top of one slice of bread. Add a pinch of flakey salt on top of the other.
Stack the two peanut buttered slices of bread on top of each other. Then top with the last slice of bread. Using a serrated knife, cut off the crust then set the toast aside.
In a deep pan, add about 1 inch of neutral oil. Heat the oil until it reaches 275F/135C.
While the oil is heating up, combine the egg, milk and salt into a shallow plate. Whisk until fully combined.
Dip each side of the toast into the egg mixture until all sides are coated and have absorbed all the egg mixture.
Place the toast into the hot oil and dip each side for about 10-15 seconds to seal the toast. Once all sides have been sealed, lay the toast flat and fry on each side for 1-2 minutes or until golden brown.
To get the toast evenly golden brown, spoon the oil over the toast while it's frying until it reaches your desired color.- Remove and allow it to slightly cool on a wire rack.
Serve with a knob of butter and a drizzle of condensed milk. Enjoy!