Cream together the softened butter and sugar for a full 5 minutes.
Add the eggs and vanilla into the mixture, and beat for another 5 minutes.
Add the cocoa, salt and flour, this time mixing until just combined. Do not over mix at this point.
Fold in 1 cup of mini chocolate chips.
Spread the mixture into a greased 9x13 pan.
Bake at a 350° for 30-35 minutes. They are cooked through when a toothpick comes out with a few moist crumbs attached to it. If it comes out completely clean the brownies have been over baked.
Allow the brownies to cool completely in the pan.
Store at room temperature in an air tight container for up to 4 days.
Notes
You can double the recipe and bake in a cookie sheet or half the recipe and bake in a square 8x8 pan.