Best Brownies Ever

1 cup butter
4 eggs
2 cups sugar
1/2 teaspoon salt
2 teaspoons vanilla
8 Tablespoons (1/2 cup) cocoa
1 cup flour
1 cup chocolate chips, optional

Soften butter.
Add eggs, sugar, salt, vanilla, and cocoa.
Mix well.
Fold in flour and chocolate chips.
Pour into 9"x13" pan.
Bake at 325* for 30-35 minutes.