Preheat oven to 350°F. You will need a 6.25” mini cast iron skillet to make this cookie as shown. If you don’t have a skillet, you can use a 6” cake pan, and 8x4” loaf pan, or make individual cookies in a muffin pan. If you are using a skillet, cake, or loaf pan, spray it with nonstick cooking spray. If you’re using a muffin pan, use liners for easy removal and serving (it will probably make about 4 muffin sized cookies).
Melt butter in a large bowl. Stir in both sugars, then egg yolk, extract, baking soda and salt. Carefully stir in the flour then mix in the chocolate chips.
Optional: add 1/3 cup of ANY kind of chips or candy instead of the mini chips called for, if you wish.
Bake the mini cast iron skillet for about 18-24 minutes, or until the edges are puffed and the center no longer looks translucent. Using another pan will affect baking time.
Serve warm, with lots of whipped cream or ice cream and sprinkles.
Notes
This skillet cookie is best enjoyed warm, straight from the oven. For an extra decadent treat, top with a scoop of vanilla ice cream and a generous dollop of whipped cream.