Dark Chocolate Chunk Skillet Cookie

I've made a skillet chocolate chip cookie before. It was delicious. But I had earmarked two skillet chocolate chip cookies, so I had to try this one as well. This version from How Sweet It Is wins for the simplicity factor. From what I recall, both are equally delicious, so this shall be the repeated recipe. This is super fast to make and wonderfully delicious topped with vanilla ice cream.

Dark Chocolate Chunk Skillet Cookie
1 stick butter
1/2 cup sugar
1/2 cup brown sugar
1 tsp. vanilla
1 egg
1 3/4- 2 cups flour
3/4 tsp. baking soda
1/4 tsp. salt
1 cup dark and/or semi-sweet chocolate, cut into chunks 

Preheat oven to 350˚F. Melt butter in an 10-inch cast iron skillet set over medium-low heat. Stir in sugars and vanilla, and remove from heat. Let rest until pan is warm about 5 minutes.

Crack an egg onto the butter and sugar mixture, and use a fork to whisk it into the mixture. Place flour, baking soda and salt on top, and very carefully stir the mixture until smooth and well mixed. Stir in chocolate chunks. 

Bake for 15 to 25 minutes, or until  golden on the top and around the edges but still soft in the center. Serve with vanilla ice cream. Makes 8 generous cookie portions.