Double chocolate-walnut cookies 
from vanillasugarblog.com

3 sticks unsalted butter (24 TB), room temp
¾ cup granulated sugar
¾ cup packed light brown sugar
2 large eggs
3 TB half & half (or cream), might need more
1 ½ ts pure vanilla extract
3 cups all purpose flour
¾ cup dark double dutch cocoa powder (regular dutch ok too, but flavor isn’t as intense)
½ ts cinnamon (I used Vietnamese cinnamon for a deep intense flavor)
Oversized ¾ ts sea salt
1 ½ ts baking powder
½ ts baking soda
1 ½ cups of 60 % (or higher cocoa) dark chocolate chips or chopped chocolate
1 cup of toasted walnuts, rough chop

In a mixing bowl, using an electric mixer, or by hand beat butter and both sugars just until creamy. Don’t overbeat. Add in the eggs, vanilla, and half & half and beat just until incorporated.
In another bowl mix the flour, cocoa powder, cinnamon, baking soda, baking powder and salt. When thoroughly mixed, add to batter and stir just until blended. Lumps are good.
Stir in chocolate chips and walnuts.
Keep in mind this dough is very hard and thick. It’s also very sticky, and might be a little dry.
OK to add a dash or two more of half & half to mixture to make it come together only if it’s really dry and too crumbly.
Cover and chill this at least 3 hours before baking; this will help it come together.

When ready to bake:
Always keep the dough cold as you can—this lends a nice tender/flaky cookie that won’t spread much.
Warm dough will yield a flatter cookie. Bake first batch, keep remaining batch in fridge till ready to use. 
Or shape all cookie dough balls, place on a plate or tray, and keep in fridge as they are ready to bake.
Preheat oven to 385 degrees.

You can either make them into huge cookies (as I did) or smaller ones.
Whichever you choose, keep the dough in balls, do not flatten.
Divide dough into 12-14 big lumps. Mold into HUGE golfballs; do not press flat!
Keep them as balls on the cookie sheets. Bake on ungreased cookies sheets (one sheet at a time).
For larger cookies bake 13-16 minutes, smaller cookies 10-15 minutes.
Rotate pan halfway through.
It will be hard to tell when the cookies are done. Look for crackles on side, cooked/semi-firm tops; they should be a bit soft in the middle. They will set up as they are cooling (trust me).
Don’t overbake or they will turn into scones. Once baked don’t try and move the cookies off the pan, they will break apart, let them chill a bit before touching.
Makes 12-14 giant cookies or 22-24 smaller cookies.