This recipe is from my sister's mother-in-law. It is my take-everywhere recipe and is often requested by coworkers and friends. It's an easy, quick, no-bake recipe. I have a hard time not eating-as-I-go when I make these. As a personal choice, I use milk chocolate chips, but semi-sweet are good too. They take about 20 minutes to make, the long cook time includes the hour of refrigeration for bars to set.