In a heavy-bottomed pot over medium-low heat, melt the butter. Add the onions, cover, and cook for around fifteen minutes. This allows the onions to steam and release a large portion of their water fairly quickly. While they are steaming, stir them every few minutes.

Uncover the onions and at this point, they will probably begin to look caramelized. Uncover them, stir, add the dried herbs, and turn the heat to low (as low as it can go). Let them continue to slowly caramelize for around 30 minutes, stirring every five minutes or so. Add the garlic and cook for another five minutes, stirring frequently.

Turn off the heat and deglaze with the red chile puree, scraping the bottom of the pan with a wooden spoon. Carefully transfer this mixture to a blender or food processor and buzz just a few times and let it come to room temperature.

Once the onions are cooled to room temperature, add the cream cheese to the bowl of a stand mixer with a paddle attachment and whisk for about a minute until it’s light and airy. Add the sour cream and mix again. Now add the onion mixture and mix until everything is distributed. Check seasoning and add salt and/or pepper as needed. Transfer to a bowl and garnish with chives.