1 medium yellow onion, peeled and diced 1/4 cup unsalted butter 1/2 cup real mayonnaise 1/2 cup sour cream 1/4 tsp chipotle pepper or cayenne 1/2 tsp kosher salt or sea salt Heat butter in medium saute pan Once butter is bubbly, add onions Reduce heat to medium-low and cook, stirring occasionally, until onions become golden brown, soft and sweet, about 25 minutes Put all ingedients in bowl of food processor or blender; mix until very well combined Adjust seasoning to taste and serve with vegetables or plain chips