Ingredients 1 3/4 cups (230g) all purpose flour 1/4 cup (30g) cornstarch 1 cup (100g) unsweetened cocoa powder 2 tsp baking soda 1 tsp baking powder 1/2 tsp kosher salt 1 cup (200g) granulated sugar 1 cup (205g) dark brown sugar · packed 1/2 cup (108g) vegetable oil 1 cup (230g) mayonnaise 3 large eggs + 1 egg yolk 1/2 cup (128g) milk 1 tbsp vinegar 2 tsp vanilla extract 1 cup (240g) hot coffee (or 1 cup hot water + 2 tsp instant espresso powder) 2 cups (450g) unsalted butter · room temp 1 1/2 cups (165g) powdered sugar 3 tbsp corn syrup 1 tsp vanilla extract Pinch of kosher salt 3/4 cup (177g) warm water 3/4 cup (75g) dutch process cocoa powder (or unsweetened cocoa powder) 10 oz dark chocolate chips (one bag) · melted and cooled slightly Preheat the oven to 350F and prep 3 8″ cake pans. Grease the inside and line the bottom with parchment paper. If you have them, wrap the pans in damp cake strips and set aside.
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