Cheesesteak Sub Dip

This is the best dip for parties!  Who doesn't love a cheesesteak sub??!

Ingredients:

1/4 cup chopped onion
1 tablespoon butter
8 oz Neufchatel cheese, cubed
1 cup milk (I use 1%)
14 oz can of mushrooms, drained and diced (optional)
1 (2 1/2 oz) package of dried smoked sliced beef, finely chopped (this is typically found near the pepperoni, hot dogs, etc)
1/4 cup Parmesan cheese
salt & pepper, to taste

Directions:

1.  Saute the onion in the butter.

2.  Add cream cheese and milk.

3.  Stir over low heat until cream cheese is melted.

4.  Stir in remaining ingredients and heat thoroughly. 

5.  Serve in a mini crock pot with cubed fresh Italian bread.