1. Use full fat cream cheese and sour cream for clean slices 2. do not overmix after adding eggs to reduce cracking 3. melt cookie butter in short bursts and cool slightly before swirling 4. for thicker bars use a 9x9 inch pan and add 5 to 10 minutes bake time 5. store chilled up to 5 days or freeze sliced bars up to 2 months