Preheat oven to 400ºF/205ºC Blend the flour, granulated sugar, baking powder, and salt. Cut in the 1/4 cup cold butter. Add the milk and stir until just combined. Let sit in fridge while making the filling. Mix together the 1/3 cup softened butter, brown sugar and cinnamon until formed into a paste. Take the dough out of the fridge, roll out on a floured surface to a rectangle approximately 12"/30cm by 18"/46cm. Grease a 12 cup muffin tin well. Place approximately 1/2-1 tsp of the filling into the base of each cup of the muffin tin. Spread the remaining filling over the rectangle of dough. If using, sprinkle raisins and pecans over the topping. Roll the dough from the long edge up, so you end up with a 18"/46cm roll. Cut the roll into 12. Place the rolls, with a cut side down, into the prepared muffin tin. Bake for 20 minutes, or until the buns are golden brown. Let cool 5 minutes, then remove from tin. Serve.