Salted Caramel-Chocolate Pudding Cake

Ingredients

• 2 teaspoons instant espresso powder
• 1 1/2 cups boiling water
• 1/3 cup natural cocoa powder
• 1/3 cup (about 2 1/3 ounces) granulated sugar
• 1/3 cup (about 2 1/3 ounces) packed dark brown sugar
• non-stick baking spray
• 1/3 cup (about 2 1/3 ounces) granulated sugar
• 2 tablespoons light corn syrup
• 1 tablespoon water
• 6 tablespoons heavy cream
• 6 tablespoons (3 ounces) unsalted butter, cut into 6 pieces
• 3/4 cup (about 3 3/4 ounces) all-purpose flour
• 2 teaspoons baking powder
• 1/2 teaspoon salt
• 1/3 cup (about 2 1/3 ounces) packed dark brown sugar
• 2 large egg yolks
• 2 teaspoons pure vanilla extract
• 1/3 cup whole milk
• 1 teaspoon coarse sea salt, such as maldon