Step 1

Preheat oven to 375º F and line a baking sheet (jelly roll pan) with parchment paper or grease with non-stick spray.

Step 2

In a medium bowl, whisk together flour, baking powder, baking soda and salt, and set aside.

Step 3

In a small bowl or measuring cup, combine Irish cream and creamer and stir together.

Step 4

In a large bowl or mixer, cream butter and sugar together until fluffy and lightened in color. 2-3 minutes.

Step 5

Beat in eggs and vanilla extract until incorporated, then alternate between adding dry ingredients and Irish cream mixture, beginning and ending with dry ingredients.

Step 6

Pour batter into greased baking sheet and spread into an even layer.

Step 7

Place baking sheet in oven and bake for 17-19 minutes, or until edges pull away from sides of pan and toothpick inserted in center comes out clean.

Step 8

For the icing: in a medium or large saucepan, whisk together butter, sugar, Irish creamer and milk over medium-high heat. Bring mixture to a boil, then remove from heat.

Step 9

Stir in 4 cups powdered sugar (to start), vanilla extract and salt, stirring until smooth and thickened. (Add more powdered sugar, if desired.) Pour over cake and let set.