2 oz. Bittersweet chocolate, chopped
1 tsp. Flaked sea salt, divided
1/2 cup Unsalted butter
1/2 cup Pure maple syrup
1/2 cup Packed light brown sugar
1/4 cup Whipping cream, divided
2 tsp. Pure vanilla extract oil
1 Large egg
4 cups Coarsely chopped raw nuts
1 All-Purpose Piecrust
All-purpose flour, for work surface