Add the following configuration to `launch.json` `configurations` array to start bench console and use debugger. Replace `mysite.localhost` with appropriate site. Also replace `frappe-bench` with name of the bench directory.
```json
{
"name": "Bench Console",
"type": "python",
"request": "launch",
"program": "${workspaceFolder}/frappe-bench/apps/frappe/frappe/utils/bench_helper.py",
"args": ["frappe", "--site", "mysite.localhost", "console"],
"pythonPath": "${workspaceFolder}/frappe-bench/env/bin/python",
"cwd": "${workspaceFolder}/frappe-bench/sites",
"env": {
"DEV_SERVER": "1"
}
```