Here is the recipe I was given in 1979 and it sure tastes like the stuff at the restaurant.

MEXICO CHIQUITO CHEESE DIP

1/2 stick butter
4 Tbsp flour
1 tsp paprika
1 tsp chili powder
1 tsp cumin powder
1 tsp pepper sauce
1 tsp cayenne pepper
1/2 tsp garlic
1 Tbsp ketchup
a dash of salt
2 cups milk
1/2 pound American Cheese

Melt butter in pan and add flour. Saute together until pastelike. Add remaining ingredients including milk. Then and the American cheese. Stir in a double boiler until thick.

I have seen different variations but this one tasted the most like it to me.

I make no claims that it is the original recipe but was given it in 1979 and told it was MC Cheese Dip. I used to have the salsa recipe and cannot locate it. It was very easy. Canned tomatoes, garlic powder, cayenne pepper and maybe some lime or rotel or something. If I find it, I will post it as well.