2 cups whole-wheat flour
1 tbsp. baking powder
1 cup peanut butter (chunky or smooth)
1 cup milk
Preheat oven to 375'F. In a bowl, combine flour and baking powder. In another bowl, mix peanut butter and milk, then add to dry ingredients and mix well. Place dough on a lightly floured surface and knead. Roll dough to 1/4 inch thickness and use a cookie cutter to cut out shapes. Bake for 20 minutes on a greased baking sheet until lightly brown. Cool on a rack, then store in an airtight container.
Personally, I just cut them into small squares. Warning; these smell amazingly like peanut butter cookies, but they don't taste that great, at least not to me. They ARE completely safe for you to eat yourself, and I've found that nothing entices a dog more than thinking it's getting something you eat.