Layered Hazelnut Brownies

Name: Layered Hazelnut Brownies
Yield: Makes 16.
Ingredients: 1 tsp. or more heavy (whipping) cream, room temperature; 2 oz. semisweet chocolate, coarsely chopped; ¾ cup finely chopped hazelnuts, toasted; ¾ tsp. pure vanilla extract; 3 tbsp. heavy (whipping) cream, room temperature; 2 cups confectioners’ sugar, sifted; 1 tsp. pure vanilla extract; 2 large eggs, lightly beaten; 2 oz. bittersweet chocolate, coarsely chopped; ½ cup unsalted butter, softened to room temperature; 1 cup granulated sugar; ¾ cup unbleached, all-purpose flour