Preheat oven to 350°.
Mix all ingredients well.
Pour ingredients onto a lightly greased cookie sheet.
Spread mixture evenly to all sides of the pan, to about 1/4 - 1/2 inch thickness.
Bake for 1 hour at 350°.
Remove pan from oven and score the 'dough', with pizza cutter or knife, into squares.
To dry treats further, return to oven and bake for 1 hour at 250° or lower.