Add apples, butter, and lemon juice to a small saucepan.
Cook covered over medium-low heat.
Add sugar a little at a time.
When apples are just starting to get tender, add flour, cinnamon, and salt. Cook 2 - 3 minutes more. Remove from heat.
Mini Apple Pies
Spread out one pie crust on a lightly floured surface. Use a wide mouth mason jar lid to cut a circle. I found that cutting just a little bit larger than the lid worked best for a regular size muffin tin.
Spray the muffin tin with a non-stick cooking spray. Push the circle of pie dough down in your muffin tin. Fill the tin with pie filling. Then cut out various shapes from the remaining pie dough with cookie cutters. Top your mini apple pies with the cutouts. The beauty of making these pies like this is you can make as many or as few as you want. Brush the tops with a little milk and sprinkle on some sugar.
Then bake at 400 degrees for 18-20 minutes or until the pie crust is nice and brown. Let sit for about 10 minutes before trying to remove from the muffin tin.