In a large skillet, heat 1 tablespoon olive oil over medium heat. Saute the sliced onions for 8-10 minutes, until lightly browned. Turn the heat down to medium low and sprinkle with salt. Stir every 10 minutes, until the onions are golden brown and tender, about 40 minutes.
Combine all ingredients in a blender. Blend until smooth and creamy.
Enjoy chilled. Spread on crackers or dip with chips and veggies.
Prefer a chunkier onion dip? Dice 1/3 of the caramelized onions and fold into the blended onion dip.