Preheat the oven to 425 degrees F. Line a baking sheet with parchment.
Combine the flour, oats, sugar, baking powder, baking soda, salt and cinnamon in a large bowl. With your hands, cut in the butter until the butter resembles small pebbles. Make a well in the center of the mixture and pour in the milk. Mix until a dough starts to form, then knead gently, 4 to 5 times, until smooth.
Pat the dough out to 1-inch thick. Cut out biscuits, using a 2-inch biscuit cutter, and transfer to a baking sheet.
Brush the biscuits with the melted butter. Transfer to the oven and bake until golden brown, 18 to 20 minutes. Remove from the oven and allow the biscuits to cool for 5 minutes.
Meanwhile, mix together the yogurt and apple butter in a bowl.
Top the biscuits with apple butter yogurt and chopped apples. Serve immediately.