For how pretty they are these marbled chocolate squares are very easy to make. They are certain to be a favourite with the kids.
My mother made this recipe when I was younger. Its wonderful! The only thing I would like to comment is that you need to wait 10 minutes before you swirl the choc chips. Then cook for another 10-15 minutes for the marble effect to look right. 3 minutes is not long enough.. that's why some people commented that it didn't swirl correctly. - 04 Dec 2006 (Review from Allrecipes USA and Canada)
I don't know WHAT happened with this recipe - I followed it exactly, and just wound up with a mushy, bubbly mess. I let it bake for as long as I could without burning it, but it was like there was way to much butter (I actually used 1 cup of margarine). Perhaps if I had cut it back to 1/2 cup, or even added an extra cup of flour, it would have turned out. Very disappointing - 16 Jan 2006 (Review from Allrecipes USA and Canada)
I thought this recipe turned out pretty good. The bars were a hit with my friends. On suggestion from the other reviewers, I used less (only 1/2 cup) of butter. This resulted in a less "bubbly" or "squishy" bar. Unlike other reviewers, I thought 3 minutes was plenty of time for the chocolate chips to melt. My advice is to check on them at 3 minutes. Poke a chip with a butter knife. If it's soft, it should marbleize just fine. If not, give it a little more time - not too much, or the bars will set. Also, I decided to sprinkle a 1/2 cup pecans over the bars after 10 minutes of baking because I like pecans in chocolate chip cookies. Finally, I lightly covered the pan with foil during the last three minutes of cook time because I noticed that the surface of the bars was cooking faster than the center. The bars turned out great. As you can see in the picture I posted, they look pretty too. - 20 Sep 2008 (Review from Allrecipes USA and Canada)