To make Funfetti Cinnamon Rolls, start with the cinnamon roll dough. Warm the milk to lukewarm temperature (about 45 seconds to 1 minute in the microwave) and mix in the dry active yeast and sugar. Cover with a kitchen towel and set aside for 5-10 minutes to give it time to activate. When you remove the towel, your yeast mixture should be frothy.
In a large mixing bowl, add eggs, butter and salt and then mix in your yeast mixture and flour. If you do not have a stand mixer (like me!), once your dough has started to come together, remove it to a lightly floured surface or a glass cutting board and knead your dough by hand for approximately five minutes, working the dough and then folding it over onto itself again and again. Form the dough into a ball and move the dough to a large bowl lightly sprayed with non-stick spray, cover again with the kitchen towel and let sit at room temperature for 1-2 hours or until the dough has doubled in size.
Once your dough has proofed, move it to a lightly floured work surface and knead in your sprinles. Once your sprinkles are combined, roll out your dough to approximately 20x14 rectangle. Using your hands, spread the softened butter over the entire rectatangle. Next, combine sugar, brown sugar, cinnamon, vanilla and salt in a medium sized bowl and sprinkle evently over the buttered rectangle, gently pressing the mixture lightly into the dough. Roll the dough tightly into an even log, starting with the long side. Once rolled, trim the ends and then cut the log in half and then each half into six equal pieces so that you have 12 cinnamon rolls. Butter a 9x13 pan and place the Funfetti Cinnamon Rolls evenly spaced in your pan. Cover your pan with plastic wrap and set aside for 1 hour to allow your cinnamon rolls to proof again.
After the hour has passed, you should notice your cinnamon rolls have almost doubled in size. Preheat your oven to 350 degrees, remove the plastic wrap and bake your Funfetti Cinnamon Rolls for 25-30 minutes or until they are golden. Remove from oven and allow your rolls to cool for 5-10 minutes before frosting.
To make the cream cheese frosting, simply add the cream cheese to a large mixing bowl and beat until smooth. Add in sifted powdered sugar, softened butter and a pinch of salt and mix until light and fluffy. Spread over warm Funfetti Cinnamon Rolls and then top with more confetti sprinkles. Serve immediately.