Chocolate Coffee Cake Layers (Rich, Decadent)

Ingredients

• 2 cups (240 g) all purpose flour
• ¾ cup (60 g) Dutch process cocoa powder
• 2 teaspoons baking powder
• ½ teaspoon baking soda
• 1 teaspoon salt
• 2 teaspoons instant espresso powder
• ½ cup (118 ml) vegetable or canola oil
• ¼ cup (57 g) unsalted butter, melted
• 1½ cup (150 g) granulated sugar
• ½ cup (100 g) light brown sugar
• 2 large eggs, room temperature
• ¾ cup (180 g) sour cream, room temperature
• ½ cup (118 ml) milk, room temperature
• 2 teaspoons (10 ml) vanilla extract
• 1 cup (237 ml) very warm coffee
• 6 tablespoons (90 ml) water
• 6 tablespoons (75 g) granulated sugar
• ¼ cup (59 ml) brewed coffee
• ¼ cup (20 g) cocoa powder
• ½ teaspoon vanilla extract
• 3 tablespoons (45 ml) espresso (3 tablespoons instant espresso powder mixed into 1½ tablespoons warm water)
• 2 tablespoons (30 ml) heavy cream
• 20 tablespoons (283 g) unsalted butter, room temperature
• ¼ teaspoon salt
• 5-6 cups (600-720 g) powdered sugar