I used to boil them, cool them, then squish them, shell and all. This works so much faster. A half hour at 350 in the convection oven. A little longer or hotter in a standard oven. If you spray the pan first, it lifts right out. I have the third pan full cooling right now.
If you don't want to waste the shells, you can bake them dry and break them up too. I just toss the shells though and buy 50# of oyster shell at a time.
Deb
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