Step 1-
Prepare cookie layer. Pre-heat oven to 350 degrees. Grease a 13x18 jelly roll pan with butter or non-stick cooking spray; set aside.
Step 2-
In a large bowl, whisk together flour and baking sodea set aside. In the large bowl of an electric mixer, beat butter, sugar and lime zest until light and fluffy. Add eggs, and lime juice and mix well. Reduce speed to low and carefully add flour mixture. Stir just until combined. Spread out evenly in prepared jelly roll pan and bake for 12-16 minutes or until a knife or toothpick comes out clean and edges are light golden brown. Set aside to cool and prepare frosting.
Step 3-
Use the whisk attachment of an electric mixer to beat butter and cream cheese on high speed until light and creamy. Mix in lime juice and salt. Add in sugar ˝ a cup at a time or until at desired consistency (2 cups was the perfect amount for me but if you want a thicker texture you may want to add up to another ˝ cup).
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