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This is probably unnecessary. The powder itself should be very shelf stable so I would have just repackaged it in vacuumed sealed bags or get an attachment to vacuum seal the jars (vs heat canning).
That would cost money
Unlike heating your oven
Maybe it's his neighbor's oven?
Ziplocks and straws are usually kicking around.
You don't even need to vacuum seal it.
Just a silica pack would be more than enough.
Source: bought a few containers on sale a few years ago, all are fine.
Just closing the lid on those jars is probably overkill tbh.
Just got that vacuum sealer mason jar attachment and use it every day for coffee. Love it!
If for nothing else over OP's method of choice, with the sealer, you can take what you want and reseal without heating up a whole oven every time.
Credit to OP for using what tools they had available, but if this method improves your situation, they'll be spending more time hearing and sealing it than drinking it, plus repeated heat cycles may possibly degrade the product.
I really gotta start using mine. I keep forgetting I own it.
I use it for the coffee beans and to seal a pour over every night so I have a non watered down cold brew for the morning ready to go.
I chop bags of onions into half onion portions and celery and carrots into 2 piece portions for soups and stews. Tomato paste into 3oz portions. Curry paste into portions for individual recipes. We make vodka sauce into a 4x recipe and freeze that. Yesterday I made a full instant pot batch if black beans and frozen them into can sized portions of refried beans. Mine has a pulse function so I reseal chip bags.
I use it a lot and need to find dedicated counter space for it. Start looking at stuff that you think would either work better if it were available in single use form or stuff that is a pain to make but freezes well.
I have a vacuum sealer machine with dedicated counter space that I use for sealing things in bags pretty often, and a cabinet full of Mason jars that I use for everything (including drinking glasses). I just never think to put the two together!
Ditto mason jar vacuum sealer. So convenient!
I have a core memory of chipping away at the brick of what had previously been powdered Gatorade that had since formed into a single solid mass after sitting in the pantry for several months.