I keep asking, "Why do we keep seeking a cookie that tastes like a brownie? Why not just make brownies?" I still don't know. Maybe it's a texture thing? These chocolate chili cookies and chocolate crackle cookies were good, but no substitute for a brownie. Anyway, here's another attempt.
I reduced the recipe to 1/4 and changed out the chocolate chips for peanut butter (EXTRA chips too), because yey peanut butter! I sprinkled half of them with kosher salt to jump on the salted chocolate bandwagon (even though I'm sort of over the whole salted everything trend. Enough already.)
Here's what I used (yield 6 cookies):
1/2 teaspoon molasses
kosher salt, optional
Melt butter and unsweetened chocolate together over low heat or in the microwave until nearly melted. Off the heat, stir until it is. Stir sugar and molasses into butter and chocolate mixture, then the egg and vanilla, stirring to combine. Sift together the flour, baking soda, salt, and cocoa, and stir into the batter until completely incorporated. Stir in the peanut butter chips, making sure they're evenly distributed. In order to maintain the shape while baking, refrigerate the batter until firm but not stiff (about 15 minutes for this small amount.)
Preheat oven to 350°F. Scoop batter into about 1½- to 2-tablespoon-sized mounds and space evenly on greased baking sheets, allowing room for them to spread a little. (For a salted chocolate cookie, sprinkle lightly with kosher salt. These can also be done as a slice-and-bake.) Bake for 11 to 12 minutes for a fudgy center; they will look underbaked. Allow to cool a few minutes on the sheet, then transfer to a cooling rack.
Conclusion: As promised, these are very brownie-like. Very dense, with a rich, dark chocolate taste. The sprinkling of salt was a nice touch. They were better after being fully cooled, as I found them somewhat gummy when still warm. The moistness, even after cooling, made them still a little gummy; I might even have preferred them baked to a drier state. Very good, but due to the texture, true brownies are still the winner.
Recipe: the browniest cookies via Smitten Kitchen