Add flour, sugar, yeast, baking powder, baking soda, and salt to a standing mixer with attached dough hook. Mix on low just until combined.

In a small pan over low heat, warm the water, butter and vinegar just until butter is melted. Remove from heat. Allow to cool to 105-110 degrees, too hot and will kill yeast, too cold and won't activate it.

Whisk egg and egg white together, and then whisk it into water butter mixture.

Turn standing mixer on to medium high while pouring liquids into dry ingredients, allowing to mix for 5 minutes, scraping the sides down every so often. Turn mixer off and let sit covered in plastic wrap for 15 minutes.

Place a 18 inch long section of plastic cling wrap on the counter and create a 13x9 covered area of the cling wrap with about 1/3 cup of cornstarch.

Once dough has been allowed to rest for 15 minutes, scrape dough into center of cornstarch and dust the top with cornstarch before gently rolling into a 13x9 dough rectangle.

Preheat oven to lowest temperature. When temp is achieved (200º), turn the oven off.

Generously drizzle the melted butter on top of the dough, evenly sprinkle the sugar and cinnamon, leaving the bottom 1/2" of dough bare to allow a "seal".

From the top down, roll the dough towards the bottom gently pinching a seam.

Place the roll seam side down, and using a sharp cutting knife slice in the center first, and then 3 even slices on each side of that center cut. This gives you 7 cuts, creating 8 individual rolls. Add cornstarch to the knife as needed to allow for easy cutting.

Place a crinkled piece of parchment paper on the bottom of a large round cast iron skillet (crinkled paper allows it to stay in place). Next, place one roll in the center, and the other 7 evenly around it.

Place rolls uncovered in the now turned off, warmed up, oven. Allow to rise for 45 minutes. Remove from oven.

Preheat oven to 350º, and once temperature is achieved bake for 25 minutes or until tops are golden brown. Remove from oven and frost.

Place butter, cream cheese, powdered sugar and salt in a large mixing bowl, and using a handheld electric mixer, begin to mix until smooth. Add in vanilla, and mix until well combined. Spread on top of warm rolls.