Preheat oven to 350°F (175°C).
Grease and flour your cake pan thoroughly.
Sift flour, baking powder, and salt together.
Cream butter and sugar until light and fluffy.
Add eggs one at a time, beating well.
Mix in vanilla extract and whiskey carefully.
Alternate adding dry ingredients and buttermilk slowly.
Pour batter into prepared pan evenly.
Bake for 45-50 minutes until golden brown.
Cool in pan for 10 minutes completely.
Turn out onto wire rack to cool.
Whisk glaze ingredients until smooth and glossy.
Drizzle glaze over cooled cake generously.