Step 1

Heat the oven to 350 degrees.

Step 2

Blend together the flour, baking soda, cocoa powder and salt in a mixing bowl.

Step 3

In a separate mixing bowl, beat together the vanilla, oil and sugar.

Step 4

Slowly add the dry ingredients into the wet.

Step 5

Mix the zucchini into the batter, and let it rest for 5 minutes.

Step 6

Add water to the batter as needed if the batter is powdery. The batter should remain thick like a dough, so be careful not to add too much excess water.

Step 7

Fold in the walnuts.

Step 8

Spread the mixture into a well-greased 9x13 baking dish.

Step 9

Bake for 25-30 minutes

Step 10

Cool the brownies to room temperature.

Step 11

In a mixing bowl, blend the ingredients for the frosting.

Step 12

Spread the frosting over the brownies once cooled, and serve.