[maxerickson]

Home ovens use something similar to 2KW to run for an hour.

(it's gonna vary between models and temperatures and so on, I think 2KW is good enough for the sake of discussion)

So from there, 5KW or so is probably a good upper limit for a bread cooking cycle (it's probably less than that). Here that's ~$0.50, and then small retail packages of flour are ~$0.50 a pound. $0.25 for yeast, and trivial amounts of salt/sugar.

So (here) 2 large loaves of bread is less than $2 of ingredients and energy.

Flour is out of stock on the online store I just checked here also.