Admittedly, this is not an MoF recipe, but it is a modified version of a mid-1940’s Waring Blendor recipe. I throw this together when I need to feed Daughter something quick, but satisfying.
Blend 1 scant cup canned apricots (no juice) with 2 TBL of rolled oats, 2 TBL of the juice from the can, and 1/2 to 1 cup of milk, depending on how thick you want the smoothie. You can also add in a dash of cinnamon or nutmeg.
I suppose this would work with most canned fruits, but I haven’t tried it. I like this because it doesn’t have too much sugar, but it does have fibre, fruit, and milk (and nothing else). Notice that there is no yogurt in the recipe, as yogurt was unknown to British and American palates at the time. You could use it partly in place of milk, but I was trying to stay true to the times.