01 - Line a large baking sheet with parchment paper or silicone baking mat and set aside.
02 - In a large mixing bowl, combine Rice Krispies cereal, mini marshmallows, and pecans if using. Mix well and set aside.
03 - Melt butter in a medium saucepan over medium heat. Add brown sugar, brewed coffee, espresso powder, and sea salt. Stir constantly until mixture is smooth and begins to bubble, approximately 2-3 minutes. Remove from heat and stir in vanilla extract.
04 - Pour hot coffee mixture over the cereal mixture. Using a spatula, quickly stir until all ingredients are evenly coated.
05 - Using a cookie scoop or tablespoon, drop mounds of the mixture onto the prepared baking sheet. Press gently to form cookie shapes if needed.
06 - Place chocolate chips and coconut oil in a microwave-safe bowl. Microwave in 20-second intervals, stirring between each, until smooth. Drizzle melted chocolate over cookies.
07 - Refrigerate cookies for at least 30 minutes until completely set. Store in an airtight container in the refrigerator for up to 1 week.