3 hr 30 min — Medium — American
Four ounces of unsweetened baking chocolate and one cup of butter melt together into a dense, dark brownie batter packed with two cups of sugar and coarsely chopped nuts. A separate cream cheese layer — softened with sugar, vanilla, and one egg — swirls across the top before baking. The two layers remain distinct when sliced after chilling, showing a clean chocolate-to-cheesecake stripe. Total time runs about 3.5 hours including cooling, and the pan cuts into 48 squares.