Using Amazon CloudFormation with layers - Amazon Lambda
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Using Amazon CloudFormation with layers

You can use Amazon CloudFormation to create a layer and associate the layer with your Lambda function. The following example template creates a layer named my-lambda-layer and attaches the layer to the Lambda function using the Layers property.

---
Description: CloudFormation Template for Lambda Function with Lambda Layer
Resources:
  MyLambdaLayer:
    Type: AWS::Lambda::LayerVersion
    Properties:
      LayerName: my-lambda-layer
      Description: My Lambda Layer
      Content:
        S3Bucket: my-bucket
        S3Key: my-layer.zip
      CompatibleRuntimes:
        - python3.9
        - python3.10
        - python3.11

  MyLambdaFunction:
    Type: AWS::Lambda::Function
    Properties:
      FunctionName: my-lambda-function
      Runtime: python3.9
      Handler: index.handler
      Timeout: 10
      Policies:
        - AWSLambdaBasicExecutionRole
        - AWSLambda_ReadOnlyAccess
        - AWSXrayWriteOnlyAccess
      Layers:
        - !Ref MyLambdaLayer