Combine the apple butter, beaten eggs (no shells!) and sweetened condensed milk in a bowl and mix well.Pour into the pie shell. To avoid any spills I put the pie shell on a cookie sheet or pizza pan. Much easier to put it in the oven this way and take it out.Carefully put the pie in a 350 degree preheated oven on the middle rack. Bake for about 45 minutes. Center will jiggle when it's done and the top will have browned a little. Let cool and enjoy!