Now I'm not one of those people who meticulously measures things --- I just dump --- but I'll give you the ingredients I use and you can experiment till you get it to taste the way you like.
Oatmeal Banana Smoothies
I put the oatmeal in the blender 1st (about 1/2 cup or so) -- blend till it becomes powder like.
Next add the bananas (1 for a single serving - more for larger servings)
Add the honey and milk and blend till pureed.
Last of all add ice cubes till it thickens and reaches your desired texture.
Variations: You can....
~use sugar instead of honey
~add some frozen strawberries for some extra zing
~use plain yogurt in place of the milk
~add ice cream instead of milk and ice cubes for a milk shake consistency