Terrific Toffee Bars

Ingredients

• 1 cup brown sugar packed
• 1 cup butter softened
• 1 large egg yolk 
• 2 cups flour all-purpose
• 0.7 cup milk chocolate chips 
• 0.3 teaspoon salt 
• 1 teaspoon vanilla extract 
• 0.5 cup walnuts chopped

Equipment

• bowl
• frying pan
• oven
• wire rack
• baking pan

Directions

1. Preheat oven to 350 degrees F (175 degrees C). Lightly grease a 9x13-inch baking dish.
2. Beat butter, brown sugar, vanilla extract, and egg yolk in a large bowl; stir in flour and salt. Press dough into prepared baking dish.
3. Bake in preheated oven until crust is light brown, 25 to 30 minutes.
4. Immediately sprinkle chocolate chips over hot crust.
5. Let stand until soft, about 5 minutes, and spread evenly; sprinkle with nuts. Cool pan on wire rack for 30 minutes.