Chocolate Peanut Butter Crockpot Cake

2 cups chocolate cake mix
1/2 cup water
1/3 cup creamy peanut butter
1/2 cup chopped nuts

Combine all ingredients in bowl mixing well. Beat about 2 minutes. Pour batter into greased and floured 2 pound coffee can. Place can in crockpot. Cover top of can with 8 paper towels. Cover crockpot and bake on HIGH for 2 to 3 hours.