Here's what my AWS CLI named profiles look like:
~/.aws/credentials
[default]
aws_access_key_id = XXXXXXXXX
aws_secret_access_key = XXXXXXXXXXXXXXXXX
[burner]
aws_access_key_id = XXXXXXXXX
aws_secret_access_key = XXXXXXXXXXXXXXXXX
~/.aws/profile
[default]
output = json
region = us-west-2
[profile burner]
output = json
region = us-east-1