French Onion Chip Dip

Sooooo good.  I am very picky about my french onion chip dips. I started making my own, because I've only found one store bought that I like.   This is very good, especially after it sits for a few hours.

FRENCH ONION CHIP DIP
(serves 16-20)

Ingredients:
*1 tablespoon butter
*1 tablespoon olive oil
*1 1/2 cups onions, diced
*1/4 teaspoon kosher salt
*2 garlic cloves, minced
*2 cups sour cream
*1/2 cup mayonnaise
*1/4 teaspoon white pepper
*1/2 teaspoon kosher salt
*1/2 teaspoons celery salt
*1 teaspoon worcestershire sauce
*1 1/2 teaspoons dried chives (optional)

Directions:
~In a medium saucepan over medium heat, add 1 tablespoon butter and 1 tablespoon olive oil.
~Once butter is melted, add 1/4 teaspoon salt and 1 1/2 cups diced onions.
~Cook until onions for about 15 minutes.
~Add 2 minced garlic cloves and cook another 5-10 minutes (onions should be caramelized).
~Remove from heat and let cool.
~Once onion mixture is completely cooled mix in 2 cups sour cream, 1/2 cup mayonnaise, 1/4 teaspoon white pepper,  1/2 teaspoon kosher salt, 1/2 teaspoon celery salt, 1 1/2 teaspoons dried chives and 1 teaspoon Worcestershire sauce.
~Refrigerate for at least 2 hours.
~Stir before serving.