Sandy,
I also loved that restaurant and do not have their recipe but when I came home from there, I tried to duplicate it. This is what I did...

Southern Kitchen House Dressing (copycat)

In a blender container place:
1 (8 oz.) bottle Wishbone Deluxe French dressing
1/8 to 1/4 tsp. (to desired taste) garlic powder
1/8 tsp. onion powder
scant 1/8 tsp. cayenne pepper
2 oz. Kraft American process cheese
2 Tbsp. lemon juice or vinegar
2 Tbsp. milk

Whir together well until smooth.

Yield: about 1 3/4 cup

Give this a try and see what you think, let me know if you come up with something else. I do not have their cinnamon roll recipe; would you care to share it?