Pre-heat oven to 400 degrees. Prepare a 12-count muffin tin by greasing or lining with muffin liners.
Combine dry ingredients in a large mixing bowl. Whisk ingredients together well.
1/2 cup granulated sugar, 2 cups all purpose flour, 2 tsp ground cinnamon, 2 tsp baking powder, 1/4 tsp salt
Add wet ingredients to dry ingredients and mix to combine.
1/4 cup butter, melted, 1 cup milk, 1 large egg
Fill each muffin cup about halfway with the batter. Spoon 2 teaspoonfuls of apple butter to each cup. Then top with remaining batter.
1/2 cup apple butter
Bake in preheated oven about 20-23 minutes.