Fool 'Em "Cream Cheese" Spinach-Artichoke Dip

finely diced yellow onion

large cloves garlic (minced)

fresh spinach (chopped into smaller pieces)

artichoke hearts ((14 ounces) drained well)

plain unsweetened dairy-free yogurt

distilled white vinegar

raw cashews ((unsalted))

fine salt

ground black pepper

packed cooked peeled Yukon Gold potato

red pepper flakes (for garnish (optional))

pita chips or veggies (for serving)