AWS Lambda functions that are triggered from Amazon MSK topics can now access MSK clusters secured by IAM Access Control. This is in addition to SASL/SCRAM, which is already supported on Lambda. To get started, customers who select MSK as the event source for their Lambda function can configure their function’s execution role to allow Lambda to connect to their clusters and read from their topics. This feature requires no additional charge to use, and is available in all AWS Regions where Amazon MSK is supported as an event source for AWS Lambda.
Source:: Amazon AWS