Using AWS SAM with layers - AWS Lambda
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Using AWS SAM with layers

You can use the AWS Serverless Application Model (AWS SAM) to automate the creation of layers in your application. The AWS::Serverless::LayerVersion resource type creates a layer version that you can reference from your Lambda function configuration.

AWSTemplateFormatVersion: '2010-09-09'
Transform: 'AWS::Serverless-2016-10-31'
Description: AWS SAM Template for Lambda Function with Lambda Layer

Resources:
  MyLambdaLayer:
    Type: AWS::Serverless::LayerVersion
    Properties:
      LayerName: my-lambda-layer
      Description: My Lambda Layer
      ContentUri: s3://amzn-s3-demo-bucket/my-layer.zip
      CompatibleRuntimes:
        - python3.9
        - python3.10
        - python3.11

  MyLambdaFunction:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: MyLambdaFunction
      Runtime: python3.9
      Handler: app.handler
      CodeUri: s3://amzn-s3-demo-bucket/my-function
      Layers:
        - !Ref MyLambdaLayer