Slice your day-old bread into thick pieces. This gives your toast the sturdy structure needed for that crunch Trenary Toast is known for.
In a bowl, combine sugar and cinnamon. Stir well until fully blended. Melt the butter separately and mix it with vanilla extract.
Brush both sides of each bread slice with the butter mixture. Then press each slice into the cinnamon-sugar mixture until fully coated.
Arrange the slices on a parchment-lined baking sheet. Bake at 300°F for 20 minutes or until hard, dry, and crunchy like classic Trenary Toast.
Let the toast cool completely. It will become even crispier as it rests, making it perfect for dipping in coffee or snacking on its own.
