Make your paste by adding 1/3 c milk, 1/2 c hot tap water and 1/3 c bread flour. Turn heat to medium and whisk until a thick paste forms and the lumps are all worked out. Set aside.
In another pot warm 2/3 C milk over low medium heat until it reaches 100-110 degrees Fahrenheit. Use a thermometer to check.
Add warm milk and instant yeast to a large mixing bowl or to a stand mixer bowl.
To the yeast and milk add the sugar, melted salted butter, egg, salt and prepared paste. Mix on low until everything is combined.
Add 3 2/3 c bread flour a cup at a time to the mixture. Allow it to come together then switch out the paddle for the dough hook. Knead for 15 minutes on medium speed.
Place dough ball in a lightly greased bowl and cover for an hour in a warm dry place. I either preheat my oven to 200 degrees and turn it off once I put the bowl in the oven or I place in the microwave (off of course) covered in saran wrap.
Roll dough out on a floured surface to 24x15" -- I use a measuring tape to make sure I get the size right.
Spread 8 tbsp or a stick of softened kerrygold salted butter evenly over top of the dough. It needs to be extra soft but not melted.
Mix brown sugar and cinnamon together in a bowl then sprinkle on top of the butter and dough evenly.
Tightly roll up the dough and cut into 10-12 rolls.
Place on a parchment lined sheet pan with space between each roll.
Warm heavy whipping cream and pour over the rolls.
Bake at 375 for 18-20 minutes.
While the rolls bake, mix the icing with the whisk attachment or a hand mixer. Add cream cheese, salted butter and beat until fluffy. Add powdered sugar one cup at a time. Scrape the bowl as needed. Add the vanilla and mix until fully combined.
Allow rolls to rest 5-10 minutes before slathering in icing.