Instructions: Saute onion in skillet over medium heat until softened. Add tomatoes and chilies and then cook 2 minutes. Transfer to large bowl and stir in spinach, cheese, cream cheese, half and half and vinegar. Season with salt and pepper.

Spoon mixture into shallow baking dish and bake in 400 degree oven until dip is bubbly and top is light brown, about 35 minutes. Top with a spoon of sour cream and serve with tortilla chips.

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