How to cook homemade versions of the frozen veggie burgers, etc?

And would it be cheaper to make it homemade or to buy them already made?
I’m talking about the garden burgers, black bean burgers, chick*n patties and nuggets, etc etc etc.
Do you think it would be cheaper to make these myself and freeze them, or to just buy them already made from Boca, Morningstar, etc?
And do you have any recipes or ideas on how to make these homemade?
Thanks kindly in advance!