Blend all ingredients for avocado dip in a food processor until smooth. Pour into the bottom 3/4 of an oval below and spread into an even layer.
Garnish with cheddar cheese to create witch’s hair, Kalamata olives for the eyebrows, pimento olives for the eyes, a gherkin for the nose, the sliced end of a carrot for the wart, and sliced radishes for the lips.
Arrange tortilla chips above the head to create the witch’s hat. Enjoy!