Putting seeds in the oven seems like a foolproof way to kill them! Few seed will stay viable at a temperature above 95°F - and few ovens will reliably keep a low temperature, even with the door open.
It's true that some tricky seeds like parsley can be shocked into life eg. by immersion in bleach. But the only foolproof way to start almost any seed is to put it in a margarine tub of damp perlite or white sand, with the lid on, for seven days in a temperature of 75°-80°F.
That will sprout anything, even parsley, with the exception of coconuts. They have to float in the sea for three years
I think that roasting seed in the oven is one of those 'never tried' tips that are best forgotten.
