Heat the oven to 425 degrees and grease the muffin tin.
Stir flour, brown sugar, baking powder, baking soda and salt together in a large bowl.
In a separate bowl, melt butter in microwave.
With a fork, stir apple butter, milk and egg into melted butter until well combined.
Pour wet ingredients into dry ingredients and stir with a spoon just until moistened. The batter will be lumpy.
Pour into 12 muffin cups and bake for 15 minutes.