Add the biscuit mix, milk, sugar, and cinnamon to a large bowl. Mix everything together until combined. Don't over-mix.
Drop the biscuits onto a baking sheet or large skillet about 1 to 2 inches apart. (I had mine in the photos about ½-inch apart and they touched each other when baking. I prefer to have them not touch.)
Bake at 425° for 12-15 minutes or until the biscuits turn golden brown. The size of your biscuits will determine cooking time. I used a ¼ cup spring release scoop for my biscuits.
Glaze
Whisk the sifted powdered sugar, whipping cream, and vanilla extract in a medium mixing bowl.
When the biscuits are done, remove them from the oven and drizzle the glaze over them while they're still hot. Serve warm and enjoy!