template.yaml

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: Example AWS SAM template that utilizes a lambda layer

Parameters:
    MyLayerLatestVersion:
        Type: 'AWS::SSM::Parameter::Value<String>'
        Default: '/Layers/MyLayer/Latest'

Resources:
    MyFunction:
        Type: AWS::Serverless::Function # More info about Function Resource: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction
        Properties:
            CodeUri: src/
            Handler: app.lambda_handler
            Runtime: python3.6
            Layers:
                - !Ref MyLayerLatestVersion