Soft peanut butter bird food usually consists of peanut butter, suet, some type of cracker crumbs or cereal and seeds. Hard tidbit cakes generally include suet, peanut butter and corn meal.
To make a soft suet recipe which yields 4 blocks, melt 1 cup peanut butter and 1/2 cup each of suet and lard. Alternatively, use 1 cup of suet and omit the lard. Next, mix in 2 cups of oatmeal, 1 cup of mixed bird seed, 1 cup of corn meal, 1/2 cup of whole wheat flour and 1 cup of chopped cranberries or raisins. Combine well, form into 4-inch blocks, and freeze.
To make hard peanut butter suet cakes, combine 2 cups fresh ground suet, 1 cup peanut butter, and 2 cups each of yellow corn meal and fine cracked corn. First, melt the suet in a sauce pan, allow it to cool and then reheat it. Next, add the peanut butter allow it to melt, and stir until well blended. Add the dry ingredients, and mix well. Pour the mixture into forms or suet feeders, and let it cool.
Bird Watcher's Digest notes that suet- and lard-based food is a treat during the winter months and in harsh weather, but too much suet may harm the birds.