Preheat the broiler. Line a baking sheet with aluminum foil or parchment paper. Spread the chips in one crowded layer on the baking sheet. Evenly sprinkle the sausage over the chips. Top with the cheeses, dot with the giardiniera and tomato halves, then broil until the cheese is just melted, 1 to 3 minutes. Carefully slide the parchment paper and chips onto a platter or eat straight from the tray.