Melt 2 Tbsp of Butter with the 1/4 sliced Onion and let it turn translucent, do not let the butter burn, keep on low heat and cover, but check
Add In Broccoli and allow it to cook with lid on as well and add a little broth about 1/4 C
Once Softened (about 10 minutes maximum, Separate the broccoli and onions into a blender, Ninja, etc leaving behind the melted butter and soup mixture, using a slotted spoon is best.
Take the Broccoli, Cream Cheese and all but the last 1/4 C of Vegetable Broth and place in blender. Pulse to mix.