Prepare the coffee cake: Heat oven to 375°F. Grease an 8-inch square cake pan.
Place biscuit pieces into the prepared pan. Fit them tightly into the pan.
Bake until golden brown, about 25 minutes.
Prepare the glaze: stir together powdered sugar and milk until smooth. If glaze is thick, add a teaspoon additional milk.
Pour glaze evenly over cake. Enjoy. Cake keeps for about a day. Store the leftovers covered on the counter.