[header] How to bake a vanilla mirror glaze cake [title] Preheat oven to 400 degrees fahrenheit or 204 degrees celsius. [title] Spread butter onto an eight-inch cake pan with a silicon spatula. [title] Whisk the flour, baking powder, and salt in a large bowl. 
[title] Add the butter one teaspoon at time, while mixing with an electric mixer, at low speed, until ½ cup of butter is added. [title] Keep the blender on as you slowly add the sugar to the mixture.