In a mixing bowl, whisk together flour, baking powder, salt and baking soda to combined. With a pastry cutter or two knives, cut 6 TBSP butter into mixture until approx pea-sized.
Gradually, stir in milk and mix until dough forms.
On a floured surface, turn dough until smooth. Roll dough into approx a 15 x 10 inch rectangle.
Spread dough rectangle with 1/3 cup of soft butter.
In a bowl. mix together remainder of filling ingredients. Sprinkle evenly over butter. If you have some leftover, that’s OK.
Roll rectangle, starting from the shorter side of dough. Seal dough at the seam. Then, cut dough into 10 rolls.
Place rolls in crock pot. Sprinkle with leftover cinnamon/sugar filling mixture.
Cover and cook on high for 1 1/2- 2 hours. Sides of the rolls with be browned, but, tops should be still slightly wet.
Remove crock insert from your crock pot and remove lid. Let rolls cool for 20-30 minutes before frosting.