Place grated zucchini in a colander to drain. Sprinkle salt on it.
Mix flour, cocoa, soda, and cinnamon.
Mix (in a seperate bowl) eggs and sugar. Add oil. Combine dry with moist ingredients.
Press down on the zucchini with paper towels to extract all moisture. Stir zucchini into batter.
Pour into the pan and bake for 20-25 min. Frost with frosting.
For the frosting
Beat first 3 ingredients at medium speed with an electric mixer until creamy.
Whisk together powdered sugar and cocoa. Gradually add powdered sugar mixture alternately with 3 Tbsp. milk, 1 Tbsp. at a time, beating at low speed until blended and smooth after each addition.
Beat in up to 4 Tbsp. additional milk for desired consistency.
Recipe by Mandy's Recipe Box at https://mandysrecipeboxblog.com/chocolate-zucchini-cake/