Heat a skillet or griddle over medium heat.
In a shallow dish, add the coconut milk, eggs, and vanilla. Whisk together.
Soak a slice of the brioche bread in the egg mixture and flip, so both sides are soaked in the mixture.
Once the griddle is hot, cook the bread until nicely browned on each side. Keep warm in the oven if needed while you repeat with the other slices of bread.
To make the bananas foster, heat the butter and brown sugar over medium heat in a skillet. Mix to create a sauce. Add the bananas and let cook until slightly thickened and sticky.
To assemble, slice each piece of brioche bread in half diagonally. Place 3 halfs on each plate and top with the bananas foster mixture. Add freshly whipped cream, if desired. Serve and eat immediately.