Blueberry Puree(Go ahead. Sing "Raspberry Beret" with the words changed. I know I did it the whole time I made this...)
Blueberries (any amount)
Microwave blueberries, covered, for 2-3 minutes.
Mash 'em up in a food processor or blender.
I used my Boon Mush, because although it's more physical labor, it's easier to clean! Yes. I end up doing more work to avoid different work because I'm lazy!
The cooking isn't strictly required, but I do it to help soften the berries and peels so they chop and break apart more easily.
Kale Mash and/or Squished Squash.
Baby loved it. The peels didn't break up as well as I'd hoped, but at 8 months she was able to handle them, so I wasn't worried. And if you're worried about berry allergies, blueberries are in a different family than strawberries, blackberries, and raspberries, and are a lower potential allergy risk.
Froze my extras for Baby to enjoy later. Sweet purees come out of my Mumi and Bubi tray really easily. And after Baby outgrows home-made mash, I can still use these to freeze cubes of fresh herbs, separated eggs, etc. Whee!