This recipe is very similar to the sauce used at Plaza Azteca. I found it on YouTube, wrote it down and now every time that we have Mexican, Nathan wants me to make it. It is the perfect combination of spice and sweet together for a dip.
Mexican White Sauce
8 oz. miracle whip
1/2 c. milk
1 1/2 tsp. cumin
1 1/2 tsp. garlic powder
2 tsp. crushed red pepper
1 tsp. Mexican oregano (or plain oregano)
Mix all ingredients together with a whisk. Mixture looks soupy when you are first mixing it together but then thickens up as you keep mixing it. Serve warm or cold with tortilla chips.