Tiramisu Brownie Ice Cream Sandwich Bars

Bahan-bahan (8 porsi)

• 1 stick (1/2 cup) unsalted butter
• 2 ounces chocolate, milk or dark, chopped
• 3/4 cup granulated sugar
• 2 teaspoons vanilla extract
• 1 -2 tablespoons instant coffee granules
• 2 large eggs
• 1/2 cup unsweetened cocoa powder
• 1/2 cup all-purpose flour
• 1/4 teaspoon kosher salt
• 1/2 cup Nutella
• 4 ounces mascarpone cheese
• 1/2 cup sweetened condensed milk
• 1 cup heavy cream
• 1 teaspoon vanilla
• pinch of flaky sea salt