01 - Preheat the oven to 350°F (180°C).
02 - In a medium mixing bowl, blend cream cheese, cheddar, Monterey Jack, salsa, jalapeño if using, garlic powder, onion powder, smoked paprika, and season with salt and pepper. Mix until smooth and thoroughly combined.
03 - Transfer the cheese mixture into an oven-safe baking dish or, for presentation, shape the mixture into a slightly flattened ball on a parchment-lined tray to resemble a spider body.
04 - Bake for 15 to 20 minutes until heated through, golden, and bubbling.
05 - Remove from the oven and allow to cool for 5 minutes to set.
06 - Gently insert 8 pretzel rods into each side of the warm cheese ball to serve as spider legs.
07 - Slice black olives to form eyes and body details; use a dab of sour cream for the eye whites as desired.
08 - Garnish with chopped fresh chives or parsley and present immediately with additional pretzels or crackers for dipping.