First, with a small cutting board and chef’s knife take and chop the frozen butter into small pieces. Then take and place back in the freezer while you prep the other ingredients. You want cold butter!
NOTE: You can also grate the frozen butter if you prefer but if you are like me that sounds like no fun! I think chopping the butter is an easier process.
Next, in a large bowl combine the flour, brown sugar, baking soda, baking powder, salt and cinnamon. Mix well and then set flour mixture aside.
In a medium bowl whisk together the sourdough discard, egg, vanilla extract, cream, buttermilk, and pumpkin until they are well combined.
Next you can take the chopped cinnamon butter from the freezer and toss it in the dry ingredients. You will want to work quickly at this point as you don’t want your ingredients to get too warm as you are mixing them up.