INGREDIENTS
•
1/2 cup all purpose flour
•
1 teaspoon baking powder
•
1/2 teaspoon salt
•
1 pound bittersweet (not unsweetened) or semisweet chocolate, chopped
•
1/4 cup (1/2 stick) unsalted butter
•
1 3/4 cups (packed) brown sugar
•
4 large eggs
•
1 tablespoon vanilla extract
•
5 1.4-ounce chocolate-covered English toffee bars (such as Heath), coarsely chopped*
•
1 cup walnuts, toasted, chopped
•
Flaky sea salt for sprinkling (optional)