01 - Line a large baking sheet with parchment paper or silicone baking mat to prevent sticking.
02 - In a large mixing bowl, combine Rice Krispies cereal, mini marshmallows, and pecans if using. Set aside for coating.
03 - Melt butter in a medium saucepan over medium heat. Add brown sugar, brewed coffee, espresso powder, and salt. Stir constantly until smooth and just beginning to bubble, approximately 2-3 minutes. Remove from heat and stir in vanilla extract.
04 - Pour hot coffee mixture over cereal mixture. Using a spatula, quickly stir until all ingredients are evenly coated.
05 - Using a cookie scoop or tablespoon, drop mounds of mixture onto prepared baking sheet. Press gently to shape 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 over cookies.
07 - Refrigerate cookies for at least 30 minutes until firm and set.
08 - Store in an airtight container in refrigerator for up to 1 week.