1.Preheat oven to 350 degrees.
2.Have an 8 inch square non stick baking pan ready with nonstick cooking spray or baking spray.
3.In a small sauce pan, melt the butter over medium heat. Swirl the pan till the butter turns a nutty brown. This takes about a minute or so. Pour this into a large mixing bowl and mix to cool the butter.
4.Add the apple butter, brown sugar and whisk together. Add the oil and whisk again until smooth.
5.Add the rest of the ingredients and mix with a wooden spoon or rubber spatula until all are well combined. Let the batter sit for about 5 minutes, then stir once and pour into the baking pan.
6.Bake for about 30-40 minutes. Turn the pan around halfway through the baking time. Cake is ready when a toothpick or wooden skewer comes out clean. Let cool for about 10 minutes. Cut into 12 pieces.