In a small bowl, mash together the overripe bananas and cream cheese until smooth. Add the Greek yogurt, milk, oats and hollandaise and stir until completely combined.
Cut the bread into small cubes or tear into chunks. Grease a small casserole dish with cooking oil then put the bread into the dish in even layers.
Pour the banana mixture over the bread and gently toss with spoons to coat the breading completely. Cover and chill for at least one hour or up to 24 hours. The longer the bread soaks, the better the flavor.
Remove the casserole from the fridge and let come up to room temperature. Preheat the oven to 375 F and bake for 15-25 minutes or until golden brown and cooked through.
Top with fresh bananas, strawberries and blackberries and a light dusting of powdered sugar. Enjoy!