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May 26,  · 12 Ways on How to Make Betty Crocker Cookie Mix Better 1. Add Sour Cream: Add a quarter cup of sour cream to the ingredients before cooking. This will make your cookies thicker and richer. It will also make them moister and softer for a much longer period! 2. Add an Egg: Add one extra egg to the mix before cooking, or crack it open into the cookie mix itself. .