Best Double Chocolate Cake with Black Velvet Icing

Best Double Chocolate Cake with Black Velvet Icing
𝗜𝗻𝗴𝗿𝗲𝗱𝗶𝗲𝗻𝘁𝘀 𝗳𝗼𝗿 𝗖𝗵𝗼𝗰𝗼𝗹𝗮𝘁𝗲 𝗖𝗮𝗸𝗲 🎉
1 3/4 cups (230g) all-purpose flour
1/4 cup (30g) cornstarch
1 cup (100g) unsweetened cocoa powder
2 teaspoons baking soda
1 teaspoon baking powder
1/2 teaspoon kosher salt
1 cup (200g) granulated sugar
1 cup (205g) dark brown sugar, firmly packed
1/2 cup (108g) vegetable oil
1 cup (230g) mayonnaise
3 whole eggs plus 1 egg yolk
1/2 cup (128g) milk
1 tablespoon vinegar
2 teaspoons vanilla extract
1 cup (240g) hot coffee (or 1 cup hot water mixed with 2 teaspoons instant espresso powder)

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