Grease a 9x13 inch baking pan or line it with parchment paper.
In a medium bowl, whisk together flour, ground ginger, cinnamon, nutmeg, cloves, and baking soda.
In a large bowl, beat softened butter and brown sugar until fluffy. Add molasses and vanilla extract, mixing well.
Add the egg and egg yolk, stirring until combined.
Gradually add the dry mixture to the wet ingredients, mixing until just combined.
Spread the dough evenly into the prepared baking pan.
Bake for 22-25 minutes or until the edges pull away from the sides and a toothpick comes out clean.
Cool completely in the pan on a wire rack before frosting.
For the frosting, beat butter and cream cheese together until fluffy. Gradually add powdered sugar and whipping cream/milk until desired consistency is reached.
Once bars are cool, frost generously with cream cheese mixture and add sprinkles if desired.
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Notes
Store bars in an airtight container at room temperature for up to 3 days or in the refrigerator for up to a week.