Cover the bottom of your baking pan with butter and a sprinkle of sugar, then place cinnamon roll slices in the pain and let rise until doubled in size (about 45 minutes). Bake the rolls for 30 minutes or until browned. While the rolls are baking, prepare the glaze by mixing butter, powdered sugar and vanilla extract in a bowl, then add 1 tablespoon of hot water and blend until you reach your desired consistency. Wait until the finished rolls cool a bit before adding the glaze.