The buttery shortbread, rich chocolate, and crunchy toffee bits in these Shortbread Toffee Cookie Bars make them a treat. They're a great sweet treat for any event! Ingredients: 1 cup unsalted butter, softened 1 cup packed light brown sugar 1 egg yolk 1 teaspoon vanilla extract 2 cups all-purpose flour 1/2 teaspoon salt 1 1/2 cups chocolate chips 1 cup toffee bits or chopped Heath bars Instructions: Warm the oven up to 175F 350C Mix the brown sugar and butter together in a big bowl until the mixture is smooth Mix the egg yolk and vanilla in well by beating them in Add the flour and salt and mix just until they are combined Spread the dough out evenly in the bottom of a 9x13-inch baking pan that has not been greased In a hot oven, bake for 25 to 30 minutes, or until the edges are just beginning to turn golden After taking the crust out of the oven, sprinkle th...