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 chopped pecans if using. Mix thoroughly and set aside.
03 - Place medium saucepan over medium heat. Melt butter, then add brown sugar, brewed coffee, espresso powder, and sea salt. Stir constantly for 2-3 minutes until mixture is smooth and just begins to bubble. Remove from heat immediately and stir in vanilla extract.
04 - Pour hot coffee mixture over the dry ingredients. Working quickly, fold with spatula until all components are evenly coated with the coffee syrup.
05 - Using cookie scoop or tablespoon, drop mounds onto prepared baking sheet. Gently press with fingers to shape into compact rounds.
06 - Place chocolate chips and coconut oil in microwave-safe bowl. Microwave in 20-second intervals, stirring between each, until smooth. Drizzle over shaped cookies using spoon or fork.
07 - Transfer baking sheet to refrigerator. Chill for at least 30 minutes until cookies are firm and hold their shape.
08 - Transfer cookies to airtight container. Keep refrigerated for up to 1 week for optimal texture and freshness.