I love this recipe. It is in the latest issue of Chatelaine magazine. Here is the link:
Easy Polenta Lasagna
I altered it somewhat by using ground turkey rather than ground beef. I also added green and red peppers along with mushroom and onions to the meat sauce. I used crushed tomatoes, rather than diced, only because that's what I had on hand.
I will definitely be making this again. Easy to make and a nice change from regular lasagna.