Potato Salad: Mix all ingredients; cover. Refrigerate until ready to use.
Topping with RITZ: Combine all ingredients.
For each serving: Spoon 1 cup of the Potato Salad into small ovenproof dish. Top with 3 Tbsp. of the Topping with RITZ. Bake in preheated 350ºF-convection oven for 10 to 12 min. or until potato salad is heated through and topping is golden brown.