Toffee has a nice crunch and I wanted to try adding them in the cookies along with loads of Chocolate as my little one loves Chocolate chip and Chunk Cookies. 
I used light brown sugar because of the toffee.
They came out so good and tastes delicious.
Preparation Time: 10 minutes 

Bake Time: 18 minutes 
Makes : 14 large Cookies

Ingredients:

All purpose flour: 1 cup
Light Brown sugar : 1/2 cup (You can use dark brown sugar if you have that on hand)
White sugar : 1/4 cup 
Butter : 1 stick or 8 tbsp 
Egg : 1
Baking soda: 1/2 tsp 
Vanilla extract: 1/2 tsp 
Salt : 1/2 tsp 
Chocolate toffee chips : 1 cup
Chocolate Chunks: 1/4 cup

Method:

Take the butter in a mixing bowl and beat it until it is smooth and fluffy.
Add both sugars and beat till smooth again.
Add salt, vanilla extract, egg and beat till smooth and fluffy.
Sift the flour and baking soda. Add that to the butter mixture and beat till smooth and fluffy.
Fold in the chocolate chunks and Chocolate Toffee chips.
Pre heat the oven to 350 degrees F.
Take a cookie sheet, put parachment paper on it, take a ice cream scoop full of dough and place it on the cookie sheet and bake for 18 minutes.
Cook on the cooling rack for 10 minutes before serving.

Note: If you are using dark brown sugar, reduce the toffee to 3/4 cup.