Add a Power Query icon to the quick access toolbar

There are various ways of launching the Power Query editor but they all take a few mouse clicks.

Data menu tab - Get Data - Launch Power Query editor
or
Click on an existing query and the Query menu tab - Edit
or
Data menu tab - Queries & Connections and in the Queries & Connections pane, double click on a query name.

To reduce the number of clicks required, the Launch Power Query editor icon can be added to the Quick Access Toolbar (QAT).

Navigate to the Data menu tab.
Click on the Get Data dropdown icon.

Right click on Launch Power Query editor and click on Add to Quick Access Toolbar.

The Launch Power Query editor icon will be added to Quick Access Toolbar.

Clicking on the icon will launch the Power Query editor.