Preheat oven to 350ºF and line a large rimmed baking sheet with parchment paper or a silicone baking mat.In a large mixing bowl, combine eggs and brown sugar; whisk well until combined. Add peanut butter, coconut oil, and vanilla; mix until smooth.Add cocoa powder, baking soda, and salt; use a wooden spoon or rubber spatula to mix until combined. (The batter will be thick.) Fold in chocolate chips.
Scoop and roll dough into heaping 1.5-2 Tablespoons balls, and arrange 2 inches apart on the baking sheet. Bake for 8 to 9 minutes, or until the edges appear set and the centers still look soft. Remove baking sheet from the oven and set it on a cooling rack or towel on the counter. Lift baking sheet and let it drop against the counter (or cooling rack) 1 to 2 times, which will help the cookies "drop" and spread slightly. Allow to cool for 5 minutes on the cookie sheet. Transfer to cooling rack to cool completely. Repeat with remaining cookie dough.
