01 - Line a large baking sheet with parchment paper or silicone baking mat.
02 - In a large bowl, combine Rice Krispies, mini marshmallows, and pecans if using. Set aside.
03 - In a medium saucepan over medium heat, melt butter. Add brown sugar, brewed coffee, espresso powder, and salt. Stir constantly until mixture is smooth and just begins to bubble, approximately 2–3 minutes. Remove from heat and stir in vanilla extract.
04 - Pour hot coffee mixture over Rice Krispies mixture. Quickly stir with spatula until evenly coated.
05 - Using cookie scoop or tablespoon, drop mounds onto prepared baking sheet. Press gently to shape if needed.
06 - Melt chocolate chips with coconut oil in microwave-safe bowl in 20-second increments, stirring until smooth. Drizzle over cookies.
07 - Refrigerate cookies for at least 30 minutes until firm. Store in airtight container in refrigerator for up to 1 week.