2 1/2 cups whole wheat flour
1/2 cup canned pumpkin
2 tablespoons peanut butter
1/2 teaspoon salt
1/2 teaspoon ground cinnamon
Preheat oven to 350 degrees F (175 degrees C).
Whisk together the flour, eggs, pumpkin, peanut butter, salt, and cinnamon in a bowl. Add water as needed to help make the dough workable, but the dough should be dry and stiff. Roll the dough into a 1/2-inch-thick roll. Cut into 1/2-inch pieces.
Bake in preheated oven until hard, about 40 minutes.