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