How To make Texas Brownies?

DESSERTS FROM CHEF FREDDY'S:

FOR THE brOWNIES:

2 c Flour
2 c Sugar
1/2 c Butter (1 stick)
1/2 c Shortening
1 c Coffee [brewed] or water
1/4 c Cocoa (unsweetened) [dark]
1/2 c Buttermilk
2 Eggs
1 ts Baking SODA
1 ts Vanilla

FOR THE FROSTING:

1/2 c Butter
2 tb Cocoa [dark]
1/4 c Milk
3 1/2 c Powdered sugar [unsifted]
1 ts Vanilla