Super Brownies

This is my all-time favorite brownie recipe! I grew up on it. The top is crunchy while the inside is nice and chewy.
2 cups sugar
1/2 cup butter
4 eggs
1 1/2 cups flour
1/2 tsp salt
2/3 cup cocoa
1 tsp vanilla
Cream sugar and butter. Add eggs 1 at a time and beat until fluffy. Add remaining ingredients, mix well. Bake in a greased 9x13 pan at 350 degrees F for 30 min.