I have been doing this for 5 years!!
Get 8lbs of top round steak and divide in 2lb portions.
Then mix with 1 cup of oatmeal and 1 egg white so it is mix completely.
I use tupperware that is 6in wide by 10in long and use a soup can to flatten the ball into a pattie that is 6 by 8 and 2 in thick.
I cook on Foreman grill constantly flipping so nothing will burn every 2 min but searing the first 4 times(pressing down on top of grill hard).
Cut & divide in 6 parts and put in freezer bags with 2 chicken breasts for work.
Can put salsa or mustard and 1-2 tsp of ketchup no bun

Sorry TYPE-O...no bum means no BUM