Grasshopper Bars

Ingredients

• 3/4 cups flour
• 1/2 teaspoon salt
• 1 tablespoon dark unsweetened cocoa powder (like valrhona)
• 5 ounces good quality dark chocolate (60 to 72%), coarsely chopped
• 1/2 cup (1 stick) butter, cut into 1 inch cubes
• 3/4 cups sugar
• 1/4 cup firmly packed light brown sugar
• 3 large eggs, at room temperature
• 1 teaspoons vanilla extract
• 3/4 cups sugar
• 2 tablespoons flour
• 3/4 cup milk
• 2 tablespoons heavy cream
• 1 1/2 sticks (3/4 cup) butter, softened but still cool, cut into small cubes
• 3 tablespoons creme de menthe
• 1 teaspoon peppermint extract
• 6 ounces good-quality dark chocolate (60 to 72%), coarsely chopped
• 1 teaspoon light corn syrup
• 1/2 cup (1 stick) unsalted butter, softened, cut into cubes