Nodes - whats the shortcut for mixing two nodes together? (I tried Alt-RMB)

Whats the shortcut keys for mixing two nodes together like below. I tried Alt-RMB but that created a Red-link , but I’m looing for a green-link (mix).
image

try ctrl+shift+RMB drag

also in the prefs->addon_nodewrangler you can view all hotkeys

Thats it - thanks !