Place your oven rack in the middle of the oven and then heat the oven to 350 degrees F. (175 degrees C). Then, lightly grease a 9 x 13 baking dish with either non-stick cooking spray or butter.
In a large stand mixer or a large bowl with a hand mixer, cream butter, sugar, and vanilla extract until light and fluffy, about 1-2 minutes. Add the egg yolk and mix until combined. Next, combine flour and salt and mix them into the batter.
Press the dough mixture evenly into the prepared baking dish either with your hands or a greased spatula.
Bake in the oven until the crust is golden brown, about 22-25 minutes. The bars will be soft.
Take the cookie bars out of the oven and sprinkle milk chocolate chips. Let them sit for about 5 minutes until they melt, then spread the melted chocolate evenly over the top of the cookie base with an offset spatula.
Sprinkle pecans, Heath English toffee bits, or other chopped nuts on top. Then cool to room temperature on a wire rack for about 30 minutes or until set.
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Notes
CHOCOLATE: You can substitute semi-sweet chocolate chips or dark chocolate chips instead of milk chocolate. Some readers like to use 4-5 Hershey Chocolate bars instead of chocolate chips.
We prefer these toffee bars topped with Heath Toffee Bits. However, you can use nuts like pecans or walnuts or leave the topping off altogether.
STORAGE: Store your English Toffee Bars in an airtight container on the counter for about 5 days. You can freeze your bars in an airtight container for about 3 months.Nutritional information is approximate and was calculated using a recipe nutrition label generator and will vary based on cooking methods and brands of ingredients used.