Preheat oven to 325°F. For the Cinnamon Roll Cake, dissolve yeast in warm water in small bowl. Set aside. Mix milk, granulated sugar, 1/3 cup of the melted butter, egg and salt in large bowl. Add 2 cups of the flour; mix until smooth. Add yeast mixture and remaining 1 1/2 cups flour; mix until a smooth, soft dough forms. Knead dough on lightly floured work surface 5 to 10 minutes or until dough bounces back when pressed. Place dough in a large, well greased bowl. Cover bowl with a clean kitchen towel. Place bowl in a warm, draft-free place, about 85°F, to rise until it’s doubled in size, about 1 to 1 1/2 hours.
Mix brown sugar and Seasoning in small bowl. Set aside. Roll out dough on lightly floured work surface to a 16x12inch rectangle. Brush dough with remaining 6 tablespoons melted butter. Sprinkle evenly with brown sugar mixture.
Cut into 2-inch wide strips. Roll up 1 strip starting at the short end. Place roll on top of second strip and continue rolling, so that the second strip wraps around the first roll. Place cut-side down in pie pan and continue to wrap remaining strips around cinnamon roll, one at a time, to form one giant cinnamon roll.
Bake 30 to 40 minutes or until golden brown.
Meanwhile, for the Frosting, mix all ingredients in medium bowl until smooth. Drizzle over warm cinnamon roll. Cut into wedges to serve.