In a small bowl, combine the cinnamon and sugar and toss with fork until fully incorporated.
Roll the cut up biscuits in the cinnamon and sugar mixture and place in the greased bundt pan.
Continue this process until the bundt pan is a little more than halfway full, or until all the biscuits are gone.
Place in oven and cook for 20 minutes or until the edges are slightly golden.
Make the frosting immediately.
Combine the melted butter, powdered sugar, milk, and vanilla, and mix with a hand mixer or whisk until fully combined.
Remove the warm bundt from the pan and place on a plate.
Pour the frosting over the bundt.
Best when eaten warm.
Notes
This is best when it is eaten fresh out of the oven. However, if you have some leftover, I usually keep it on the plate I served it on, then lightly apply a piece of tin foil over it.