Modified from website
1 cup milk
1 cup mayonnaise
2 tbsp sour cream
1 packet dry ranch dressing mix
1 tbsp ancho chili powder
1 tsp dried oregano
1 tsp cumin
½ tsp garlic powder
Whisk milk, mayo and sour cream. Add in rest of the ingredients. Whisk until smooth.
Refrigerate at least an hour before serving.