Butter; to grease the foil 16 tb Unsalted butter; softened

2 c Sugar

8 oz Bittersweet chocolate

- melted and slightly cooled 2 ts Vanilla extract

4 Eggs

1 c Unbleached all-purpose flour

1 ts Salt

1 c Chopped walnuts

2 c Semisweet chocolate

2 c Milk chocolate

2 c Butterscotch bits

PREHEAT OVEN TO 350F. Line an 8 3/4-by-13 1/2-inch glass or metal pan with