Preheat the oven to 350 degrees Fahrenheit
Whisk the flour, sugar, baking powder, salt, and cinnamon in a large bowl. Cut the 84 grams of butter into small pieces and add to flour mixture.
Using your fingers, crumble the butter until it resembles its the size of breadcrumbs, or in my case, its pancake flat and pretty much broken up. If you have a food processor, this is the place to use it.
Pour in the milk or buttermilk and whisk with a fork until a dough forms. Place in the fridge while you make the filling.
In a small bowl, add the brown sugar, cinnamon, nutmeg, and salt and stir to combine.
Flour a work surface and turn out the dough. Using a rolling pin, roll the dough out into a 12"x15" rectangle.
Spread the soft butter onto the top of the dough and then sprinkle the brown sugar mixture on top.
Starting on the short end of the dough, tightly roll the dough into a log and place seam side down.
Cut the log into 12 even pieces and lay flat in the 9x13 pan