Lightly spray a 9”x13” baking dish with nonstick cooking spray and create a parchment sling by laying a piece of parchment in the baking dish and up the sides. Prepare and bake the cake according to the package directions.
13.25 ounces yellow cake mix
Cool the cake for 15 minutes then use the handle of a wooden spoon to evenly poke holes all across the cake. Let the cake cool completely, about 30 minutes.
Warm the Dulce de Leches in a bowl or glass measuring cup in the microwave, just until it is a pourable consistency. Pour evenly across the cake, using a spatula to help spread it around and get it into the holes of the cake.
2 cups Dulce de Leche
In a mixing bowl, add the heavy whipping cream and vanilla extract and whip with an electric whisk or mixer with a whisk attachment on medium speed until soft peaks are formed and the cream is holding its shape. Spread evenly across the top of the cake.
2 cups heavy whipping cream, 1 teaspoon vanilla extract
Place covered in the fridge until ready to serve.
Just before serving, thinly slice the bananas and garnish the top of the cake with the sliced bananas and chopped toffee bits.
2 to 3 medium bananas, ¼ cup toffee pieces
Drizzle extra Dulce de Leches over the top of the cake.
Dulce de Leche
Slice and serve immediately.