Ingredients:

1tsp. overripe banana
1/8tsp. butterscotch flavored sundae topping
1/2tsp. (or more)toasted wheat germ
all-purpose flour as needed

Mash the banana, then mix with butterscotch syrup.
Spinkle with wheat germ and mix. Keep adding wheat
germ until the mixture is semi-firm.
Spinkle some flour on waxed paper and shape the dough
into the shape of a Tootsie Roll. Sprinkle with more flour
and cut the roll into slices, using flour to keep them from
sticking together. Give a slice to your rat!
You can wrap any left over "cookies" in waxed paper
and refrigerate them for up to four days,
or they can be frozen.

http://www.rmca.org/Articles/recipes1.htm

Ingredients:

1tsp. rolled oats
1/2 banana, mashed
2tsp. plain yogurt
1/2c. orange juice
2oz. berries, in season

Mix oats and bananas, blending well. Add yogurt,
orange juice and apple immediately to prevent browning.
Mash berries and add to mixture. Serve in small portions.
Too much fruit can cause soft stool if they aren't used to it.

Note: This recipe was originally intended for cats,
but the rats seemed to enjoy it a bit more.

http://www.kitten-cat-magazine.com/cat-treat-recipes.html

Ingredients:

1c. rolled oats
2 packets beef bouillon
1 1/2c. hot water
1/2c. dry non-fat milk
1/4c. margarine
1 egg, beaten
1c. shredded cheddar cheese
1c. cornmeal
1c. wheat germ
3c. whole wheat flour

Preheat oven to 300F.

Place the oats, bouillon, and margarine in a large bowl.
Pour the hot water over the mixture. LEt stand 5 mins.
Mix in the dry milk, egg, and shredded cheese.
Add the cornmeal and wheat germ and mix well.
Add the flour, one cup at a time, mixing well after each addition.
Knead on a lightly wheat-floured board for 3-4 mins,
adding additional wheat flour, if needed, to make a stiff dough.
Wrap the dough in waxed paper and refrigerate for about 1 hour before rolling.
On a lightly floured surface, roll the dough about 1/2 inch thick.
Cut with a dog bone(or other shape) cookie cutter and
place on a lightly greased cookie sheet. Re-roll the trimmings.
Bake in a preheated oven at 300F for 1 hour.
Turn the oven off and let the baked biscuits cool
and harden for 2 hours or more. Store in a tightly covered container.

http://www.bellaonline.com/articles/art6802.asp