I was playing around with custom blocks. Registered a couple of with the Python command

register_type_and_schema()

. However, now I want to delete those blocks but I can not find a way to do so..

The

prefect block type delete

command should do it.

delete_block_type

in the Prefect API client is another way: https://docs.prefect.io/api-ref/prefect/client/#prefect.client.orion.OrionClient.delete_block_type