I found the following recipe quite a while ago, and just now decided to try it as Lily has recently cut her first tooth...
1 package active dried yeast
1/2 cup milk
1/4 cup sugar
1/4 tsp cinnamon
1/4 tsp nutmeg
3 eggs (unbeaten)
2 cups flour
Gently warm the milk until tepid and add the yeast. Set aside for 5 mins, to allow the yeast to activate.
Melt the butter and add to the mixture, along with the sugar, cinnamon, nutmeg and eggs. Stir until thoroughly combined.
Add enough of the flour to form a dough, then knead well until the dough is smooth - you may need to add extra flour as you knead.
Set the dough aside and leave it to rise.
Once it has doubled in size (around 1hr later), divide it into 2 equal pieces and form into "rolls".
Place on an ungreased baking/cookie sheet and allow to rise again (around 30 mins).
Bake for 20 mins at 400 deg F, then cool.
Lower the oven temperature to 200 deg F, and slice the rolls into 1/2" slices.
Return to the oven and bake for a further 15-60 mins, until the zwieback toast is dry and hard.
Lily absolutely loves these, and they are just a hint sweet, without being a desert type bread. I will definitely make them again! (Boss loves them too, and hovers very close to Lily, hoping to get the dropped crumbs!) They melt just enough that she doesn't choke on them, but they don't fall apart while she is trying to eat them.
One more thing I don't have to buy pre-packaged from the grocery store!!!