This is another one of my mom's recipes...I took it to a potluck with the custodial crew recently, and I heard, "Wow! That's a fat pie!" Now the guys keep asking me when I'll bake them another one just like it. (I will post my pastry recipe separately.)
Add sugar, flour, cinnamon, and salt. Stir gently until all ingredients are mixed together.
Roll pastry for bottom crust and place in pie pan. (I use Pyrex glass pie pans.) Open an egg into pastry and use yolk to roll whites around the crust. When the crust is coated, tip egg yolk out of pie crust; discard.
Stir apple filling gently again; it should be juicy at this point. Pour apple filling into prepared crust, arranging apples to lie flat and mounded in the center. Cut 2 T. butter onto pie filling (8-9 pieces).
Roll out top crust and place over pie filling. Pinch edges together and cut decorative air vents into top of pie. Brush with milk and sprinkle with sugar.
Bake at 400 degrees for approximately 50 minutes; top will be golden brown.