In a medium skillet, make pancakes, setting into a warming oven until all are made. Pour warmed toffee sauce over stack of pancakes. Scatter crumbled Nestle Crunch Bar on top of sauce. Top with sliced bananas and serve immediately.
In a medium saucepan over medium heat, melt butter. Stir in all other ingredients, except vanilla and stir constantly until thickened. Remove from heat and stir in vanilla. Serve warm.