Preheat oven to 375°F (190°C). Line a baking sheet with parchment paper.
Unroll crescent roll dough and press into a rectangular shape on the prepared sheet, sealing the seams.
Brush melted butter evenly over the dough.
In a small bowl, mix granulated sugar and cinnamon, then sprinkle it over the buttered dough.
Bake for 10–12 minutes or until golden brown.
Meanwhile, in another small bowl, mix powdered sugar, milk, and vanilla until smooth to make the glaze.
Remove the pizza from the oven and let it cool slightly before drizzling with glaze.
Slice and serve warm or at room temperature.