Vintage Chocolate Cake – Brownie Mischief

Ingredients

• 1 1/8 cup (5 1/8 oz or 145g) all purpose flour, sifted (Plus more for dusting pans)
• 1/2 cup (1 1/2 oz or 45g) unsweetened dark cocoa powder, sifted (Plus more for dusting pans)
• 1 teaspoon baking powder
• 1/2 teaspoon baking soda
• 3/4 teaspoon fine sea salt
• 1 1/3 cups (9 1/4 oz or 262g) sugar
• 1 large egg
• 1 large egg yolk
• 2/3 cup (5 1/4 or 155ml) buttermilk
• 1/3 cup (2 1/2 oz or 74ml) vegetable oil
• 1 1/2 teaspoons pure vanilla extract
• 2/3 cup (5 1/4 oz or 155ml) hot coffee or espresso
• 1/2 cup (5 oz or 148ml) pure maple syrup
• 2 tablespoons water
• 3/4 cup (2 3/8 oz or 67g) unsweetened Dutch process or dark cocoa powder, sifted
• 1/2 teaspoon espresso powder (optional)
• 1 1/4 cups (10 oz or 283) unsalted butter, softened
• 1 cup (4 oz or 113g) powdered sugar, sifted
• 1/8 teaspoon fine sea salt
• 8 oz (or 227g) dark, bittersweet or semi-sweet chocolate, chopped (*not chocolate chips)