In a large bowl, mash the bananas with a fork or potato masher but be sure to leave a few chunks for texture. Don’t puree it.
Stir in the vanilla extract and sweetened condensed milk. Pour the mixture to a greased 9 x 13” baking dish.
Sprinkle the chopped pecans on top.
Evenly sprinkle the cake mix on top. Take the brown sugar packet (included in the crumb cake box) and sprinkle that on top of the cake mix also.
Pour the melted butter on top of the cake mixture as evenly as you can. Try to get all the cake mix moist to ensure it bakes evenly and properly. You want to avoid dry spots.
Place it into the center rack of the oven for 45-50 minutes. Let it cool slightly and drizzle the top with the caramel sauce (optional). Serve warm and with whipped cream (optional). Enjoy!