Preheat oven to 350°F. Spray a 9x9 or 8x8 baking pan with non-stick spray. Set aside.
In a large bowl, smash bananas using a fork until only small lumps remain.
Add oil, honey, eggs, vanilla and milk. Mix well.
Add flour, baking soda, baking powder and salt. Gently combine, careful not to over mix.
In a medium size bowl, combine crumble ingredients. Use your hands to combine until mixture is well-combined and only small butter pieces remain (no larger than a pea).
Evenly spread half the cake mixture in the bottom of the pan.
Top with half the crumble, spreading evenly.
Spoon large dollops of the remaining cake mixture on top of crumble. With a knife, run in a zig zag or swirl pattern to gently combine.
Top with remaining crumble.
Bake on center rack for 30-35 minutes or until knife inserted in center comes out clean.
Enjoy!!!