In large skillet, heat oil and butter over medium heat until butter is melted. Add onions, salt, sugar, and pepper and cook 10 minutes, stirring occasionally. Reduce heat to medium-low and cook 55 to 65 minutes longer or until onions are deep golden brown, stirring occasionally. Remove from heat and let cool 10 minutes.

Add cream cheese, mayonnaise, yogurt, soy sauce, fish sauce, and hot sauce to bowl of food processor fitted with knife blade attachment and process until smooth. Add cooled onions and pulse until mixture reaches your desired texture - anything from completely smooth to larger onion chunks.

Taste and adjust seasoning with a bit more soy sauce, fish sauce, or hot sauce, if needed. Transfer to serving bowl, cover, and refrigerate for at least 1 hour before serving. Serve with chips, crackers, and/or fresh vegetables.