I've been on a search for a chocolate drop cookie for some time, and finally got a really good recipe from my sister. She found it on allrecipes.com, and of course, made a couple of our usual high-altitude adjustments--less sugar and a little more flour. I usually decrease the butter, but we didn't with this cookie and it turned out great, probably because the dry, unsweetened cocoa needs the extra fat to keep the cookie from turning out dry. Also, The original recipe called for 3 cups of chocolate chips. We decreased it to 2 cups because 3 cups was way too crazy for us.
To keep the cookies soft and fudgy after they cool (and the next day), make sure you don't over-cook them, especially if you are at a high altitude. I baked mine for 9 minutes and I think they were a little over done. Next time I'll try 8 minutes. Because dry cookies make me sad.
I think this recipe is a really good base for lots of others...you could add mint chips, peanut butter chips, white chocolate chips, toffee, chopped-up candy bars. Whatever you can dream up :)
Double Chocolate-Chip Cookies
1 cup butter, room temperature
3/4 cup sugar
3/4 cup packed light brown sugar
1 teaspoon vanilla
2 1/4 cups all-purpose flour (spoon in and level)
1/3 cup unsweetened cocoa powder
1 teaspoon baking soda
1 1/2 teaspoons kosher salt
2 cups semisweet chocolate chips
1. Heat your oven to 375. Line 2 baking sheets with parchment paper.
2. In the bowl of a mixer, cream together the butter and both sugars. Add the eggs and vanilla, one at a time, mixing well after each; scrape down the sides of the bowl. Add the flour, cocoa powder, baking soda, and salt, and mix well; scrape down the sides of the bowl. Add the chocolate chips and mix gently on low until combined. Set dough aside for 15 minutes.
3. Using a regular cookie scoop (or tablespoon measuring spoon), scoop dough onto prepared baking sheets, about 1 1/2-inches apart. Bake for 8-10 minutes, or until puffed and set, but still under-done. Cool for 2 minutes on the baking sheet and then remove to paper towels to cool completely.
Makes about 36 cookies.