Preheat oven to 350°.
Cream butter in the bowl of a stand mixer to soften. Add cookie mix and eggs and mix until well combined. Spray pan with non-stick spray and spread dough into an even layer, squishing the dough flat. Use a little water on your finger to smooth the top of the cookie for a nicer appearance if you are not going to frost the top.
Bake for 34 to 40 minutes (depending on pan size and oven temp.), until sheen on top disappears and a few cracks appear. Let cool completely before removing from pan.
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