# What You'll Need:
→ Cake
01 - 2 cups all-purpose flour
02 - 2 cups granulated sugar
03 - ½ teaspoon salt
04 - 1 teaspoon baking soda
05 - ½ teaspoon ground cinnamon (optional)
06 - 1 cup unsalted butter (2 sticks)
07 - 1 cup water
08 - ¼ cup unsweetened cocoa powder
09 - 2 large eggs
10 - ½ cup sour cream
11 - 1 teaspoon vanilla extract
→ Fudgy Icing
12 - ½ cup unsalted butter (1 stick)
13 - ¼ cup unsweetened cocoa powder
14 - ⅓ cup whole milk
15 - 3½ cups powdered sugar, sifted
16 - 1 teaspoon vanilla extract
17 - 1 cup chopped pecans or walnuts (optional)
# How-To:
01 - Preheat the oven to 350°F. Grease and flour a 13x18-inch rimmed baking sheet.
02 - In a large bowl, whisk together flour, sugar, salt, baking soda, and cinnamon if using.
03 - In a medium saucepan, combine butter, water, and cocoa powder. Bring to a gentle boil over medium heat, stirring until smooth.
04 - Pour the hot chocolate mixture over the dry ingredients and stir until well combined.
05 - In a small bowl, whisk eggs, sour cream, and vanilla extract. Add to batter and mix until smooth.
06 - Pour batter into the prepared pan and smooth the top. Bake 18–20 minutes or until a toothpick inserted in the center comes out clean.
07 - While cake bakes, melt butter with cocoa powder and milk over medium heat in a saucepan. Stir until smooth and slightly boiling, then remove from heat.
08 - Whisk powdered sugar and vanilla into the warm mixture until smooth. Fold in nuts if desired.
09 - Immediately pour warm icing over the hot cake and spread quickly using an offset spatula.
10 - Allow cake to cool at room temperature until icing sets. Cut into squares and serve.