Preheat your oven to 180°C (350°F). In a small bowl, mix butter, brown sugar, and cinnamon until combined. Spread this mixture evenly on each bread slice.
Place the slices on a baking tray and bake for about 10 minutes, until the edges are golden and the sugar has melted into a glossy layer.
In a chilled bowl, whisk the heavy cream, sugar, and vanilla extract until soft peaks form. The cream should be light and airy, not stiff.
Let the toast cool slightly, then add a generous spoonful of vanilla cream on top. You can dust a bit more cinnamon over it for extra warmth.