Letting the dough rest for 15 minutes is important as it helps hydrate the dry ingredients resulting in a better texture cookie.
Don’t overbake, the cookies will seem puffy and soft when you remove them from the oven but they will continue to firm up as they cool resulting in a soft, chewy cookie.
I used devil’s food cake mix, but any chocolate cake mix can be used.
The dough will seem very dry as you first start to mix it with the wet ingredients. Do not be tempted to add more butter. Just keep mixing and it will come together to form a dough.
Substitutions
Pecans can be replaced with any nut you like. Walnuts, chopped peanuts and almonds all work well.
If you don’t want to chop chocolate you can replace with ½ cup chocolate chips.
Butter can be replaced with vegetable oil if you prefer, but the cookies may spread a little more.
How long will these cookies keep?
They will keep for about a week at room temperature if stored in an airtight container or ziplock bag. Stored in the freezer they will keep several months.