Cut bread slices into small cubes.
In wok,add bread cubes and toast on low flame until crispy & set aside.
In wok,add butter and sugar,mix well and cook on low flame until sugar melts & stir continuously.
Add vanilla essence and mix well for a minute.
Add baking soda and mix until well combined.
Turn off the flame,add toasted bread cubes and coat well.
In baking tray,add caramel bread popcorns and let them cool completely & serve.