Preheat Your Oven: Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
Prepare the Topping: In a mixing bowl, combine the melted butter, sugar, and ground cinnamon. Mix until you have a smooth, sweet paste.
Coat the Bread: Take each slice of bread and generously brush one side with the butter-sugar mixture. Ensure you cover the entire surface.
Arrange on Baking Sheet: Place the coated slices on the prepared baking sheet, sugar-side up.
Bake: Bake in the preheated oven for about 15-20 minutes or until the edges become golden brown and crispy.
Cool and Serve: Take it out of the oven and allow it to cool for a few minutes. Trenary Toast is best enjoyed fresh and crispy.