Preheat oven to 350 degrees. In a stand or electric mixer, cream butter and sugar until well combined. Slowly beat in eggs, bananas and vanilla until combined. Place flour, baking soda, cinnamon and salt into a large bowl. Slowly add to wet ingredients. Stir in Oreo's until just combined.
Scoop dough into 1 6 very mini loaf pans or 2 bread pans that have been sprayed with cooking spray. Muffin tins would work great too. Bake for 28-35 minutes if you are using the mini pan or 45-55 minutes for the normal bread pan. Toothpick comes clean from center.
Whisk powdered sugar and cream in a medium bowl until a nice drizzling consistency is reached. Drizzle over top of each bread and serve or wrap tightly in plastic wrap, the foil and place in freezer. Makes 16 mini loaves or 2 full loaves. Enjoy!