Aunt Debbie's chocolate pie

This is such a delicious and easy pie to make.  My Aunt Debbie shared the recipe with me some 15 years ago- it's become quite a classic.

1/2 cup softened butter
2 beaten eggs
2 tsp vanilla
1/2 cup granulated sugar
1/2 cup brown sugar
1/2 cup flour (I add an extra 2 tbsp for high altitude)
1 cup chocolate chips
1 cup chopped pecans or walnuts...optional

Cream the butter and eggs.  Add sugars and vanilla.  Add the flour and 1/4 tsp salt, mix until combined.  Add the chocolate chips and nuts (if using).  Pour into a pie shell and bake at 350 degrees for 50 minutes.  This is pretty awesome served warm, not super hot, and with some ice cream or whipped cream.