About 2 lbs ground turkey - don't use the really fat-free stuff
  One pkg frozen chopped spinach, thawed and squeezed fairly dry
  One egg
  About 1/3 cup dried breadcrumbs
  About 1/4 or a bit more milk
  About 1/3 to 1/2 cup parmesan or parmesan/romano blend
  One onion chopped & sauteed first
  1 tsp salt
  Pepper - I use a lot - about 1 tsp
   
  Mix it all together with your hands.  Pam a baking pan & form it
  into tennis ball size balls.  Bake about 45 min to an hour at about
  400.  It usually lets out quite a lot of watery juice which can
  smoke; if so lower the temp.  And if they don't brown because of the
  lower temp, put it under the broiler for the last 5 min or so. 
   


This can be really versatile:  I often use some other vegetable,
shredded and sauteed.  Gotta saute it long enough to boil off most of
the water.  Sometimes I use fresh spinach, precooked in some way.  I
also make golf-ball sized balls instead of the tennis ball suggested
here.