In prepared 9x13, pour half of the banana cake batter and spread evenly in bottom of pan.
Sprinkle half of the streusel mixture evenly over the batter.
Spread remaining half of batter on top of streusel layer, spreading evenly.
Finish with remaining streusel on top layer.
Bake at 350* for approx 50-60 minutes or until toothpick inserted in middle comes out clean.
Serve warm or room temperature....ENJOY!