Sedimentary Rock Bars...Not only are these super easy (you could really make any kind of layered bar cookie that you like), they teach a great lesson about how Sedimentary Rocks are formed. I made up a little printable for the kiddos that you can download here (or click on the image below).
For our bars, I used a package of Betty Crocker Peanut Butter Cookie Mix and pressed it into the bottom of a 9 x 13 pan. Bake at 325 degrees for 12 minutes. Remove from oven and sprinkle 1 Cup chocolate chips on top. Let melt and carefully spread to evenly distribute over the cookie. Then, I baked up some oatmeal cookies and crumbled them on top. For the top layer, I sprinkled on a mixture of butterscotch chips, white chocolate chips and toffee bits (can you tell I was cleaning out the pantry??!).
As I said before, you can make any type of layered cookie bar then have some fun talking about how sedimentary rocks are formed. Have fun and rock on!