Mr Food has a great tip for making sure the pie releases from the pie plate as well as a video on how to make this
http://www.mrfood.com/Pie/Upside-Down-Apple-Pie-from-Mr-FoodHe greases the pie plate then puts wax paper (parchment paper will work too) and greases the wax paper then puts the caramel nut layer. <img src="http://www.traveltalkonline.com/forums/images/graemlins/Thumbsup.gif" alt="" />
