INGREDIENTS
1 cup
unsalted butter, at room temperature
1 cup
packed dark brown sugar
1/2 cup
granulated sugar
1
large egg
1
large egg yolk
2 tsp
vanilla extract
2 1/4 cups
all-purpose flour
1 tsp
cornstarch
1 tsp
sea salt
1 tsp
baking soda
1 cup
chocolate chunks or chocolate chips
1/2 cup
chopped Heath or Skor toffee candy bars
Coarse sea salt, to sprinkle on top