For the Pie Crust: Preheat Oven 350 degrees: Combine the oats, flour, salt and sugar in a bowl and mix; add the butter and work with your fingers into crumbs. Slowly, add the milk to form dough. Adjust the milk to the dough; you may not need all of the milk. Do not make your dough too sticky. Lightly dust a clean surface with flour to roll out the dough to a ¼ inch thickness. Fit into a 9 inch pie shell and bake for 10 – 12 minutes. Remove from the oven to cool. For the Filling: Combine all of the above in a bowl and toss. Place in cooled pie crust shell. For the Topping: Combine all of the above in a bowl and work with your fingers to form crumbs. Place the crumbs generously over the pears. Use the left over dough to form hearts or your choice of shapes over the pie. Bake 40 -45 minutes.