Banana Cream Pie Overnight Oatmeal - 1/2 cup rolled oats, 1/2 cup liquid (almond milk and/or water), 3/4 - 1 ripe banana, 1/2 tsp vanilla extract, pinch of salt. Add first three ingredients to a mason jar. Mash up 2/3 of your banana and add to the jar. Slice the remaining 1/3 into the jar. Add vanilla extract and salt. Put the cover on jar and shake. Place in the fridge overnight.