Toasted Marshmallow Hot Chocolate Bars

Bahan-bahan (16 porsi)

• 2 sticks (1 cup) salted butter
• 2 cups semi-sweet chocolate chips
• 1 cup granulated sugar
• 1 tablespoon hazelnut liqueur
• 2 teaspoons vanilla extract
• 4 large eggs, at room temperature
• 1/2 cup all-purpose flour
• 1/2 cup unsweetened cocoa powder
• 1 teaspoon baking powder
• 1 -2 cups marshmallows
• 2 ounces dark chocolate chunks
• flaky sea salt