Preheat oven to 350°.

Melt butter in microwave in large bowl. Add sugar; mix well. Add eggs one at a time and mix well; stir in vanilla. Slowly blend in flour and salt. Stir until smooth. Fold in chips. Do not over mix. Pour 3/4 of the way up in cupcake tin filled with liners or sprayed with non-stick spray. Bake 25 to 30 minutes or until a toothpick inserted in the center comes out clean. Let cool slightly before removing from tin.