Make the dough:
Whisk the flour, activated charcoal, sugar, and salt together in a large bowl. Set aside.
Combine the milk and butter together in a heatproof bowl. Microwave or use the stove and heat until the butter has melted and the mixture is warm to the touch (about 110°F). Whisk in the yeast until it has dissolved. Pour mixture into the dry ingredients, vanilla extract, add the egg and stir with a sturdy rubber spatula or wooden spoon OR use a stand mixer with a paddle attachment on medium speed. Mix until a soft dough forms.
Transfer dough to a lightly floured surface. Using floured hands, knead the dough for 4 minutes. You should have a smooth ball of dough. If the dough is super soft or sticky, you can add a little more flour. Place in a lightly greased bowl (I use unsalted butter), cover loosely, and let the dough rest for about 20 minutes as you get the filling ingredients ready.
Fill the rolls:
After 20 minutes, roll the dough out in a 14×8-inch rectangle. In a medium sized bowl, combine the sugar, butter and cinnamon. Evenly spread out the cinnamon sugar butter all over the dough. Roll up the dough to make a 14-inch log. Cut into 7-8 even rolls and arrange in a lightly greased 9 inch pie dish.
Cover the pan with a clean kitchen towel. Allow the rolls to rise in a relatively warm environment for 90 minutes or until double in size.
Bake the rolls:
After the rolls have doubled in size, preheat the oven to 375°F. loosely tent the pan with aluminum foil and bake for 15 minutes. Remove the aluminum foil and bake uncovered for another 15 minutes. To ensure the rolls doneness, their internal temperature taken with an instant read thermometer should be around 195 when done. Remove pan from the oven and allow to cool while you make the icing.
Make the icing:
In a medium bowl using a handheld mixer with the whisk attachment, beat the cream cheese on high speed until smooth and creamy. Add the butter, desired food coloring and beat until smooth and combined, then beat in the confectioners’ sugar and vanilla until combined. Using a spatula, spread the icing over the warm rolls then sprinkle with halloween sprinkles. Serve immediately.
Cover leftover frosted or unfrosted rolls tightly and store at room temperature for up to 2 days or in the refrigerator for up to 5 days.