Here's a pie I make that is so simple. Even my pie-hating sister and daughter love it.
Make your pastry or buy frozen pie shells.
Put 1 large can of pears (juice and all) plus 2 -3 apples cored, peeled, and sliced into a large bowl.
Add about 1 tbsp of flour, 1/4 cup brown sugar and stir it all up, breaking up large pieces. Almost forgot the cinnamon. To your taste. My family likes a lot so I'm quite generous, perhaps 1/2 tbsp.
Pour into pie shell, you may have enough for 2 pies depending on can size and size of apples. Put on top pastry poke in some air holes then put in a 450 degree oven for 10 minutes then lower to 325 for 40 minutes.
The best homemade pie you've ever thrown together.
http://flylady.com/pages/FFT_SlowCookOther.asp