Cook bacon until crisp and drain on paper toweling.

Drain off all the bacon dripping except one tablespoonful; saute onions until soft and lightly browned.

Pulse softened cream cheese in food processor with mayonnaise, sour cream, horseradish, Dijon mustard, garlic and salt until smooth.

Stir the sauteed onions, crumbled bacon and chives into the cheese mixture by hand (so it does not over mix).

Chill before serving.