- Preheat oven to 400 degrees. 
- In mixer fitter with paddle attachment, add in the butter, sugar, salt and cayenne pepper. Mix on high for about 2 minutes, or until creamy. 
- With mixer on lowest setting, add in flour one cup at a time. 
- Add in eggs, one at a time. 
- Mix until just combined then turn off mixer and remove bowl. 
- Add in chocolate chunks and mix by hand until incorporated. 
- Grease 12 inch cast iron skillet and press cookie dough into pan until flat and even. 
- Bake for 28-33 minutes, or until edges are golden brown. 
- Can be served immediately, but be careful!