Spicy South of the Border Spinach Cheese Dip

1 onion, chopped
2 tablespoons vegetable oil
1 (14.5 oz) can whole peeled tomatoes, drained and chopped
1 (4oz) can diced green chiles, drained
1 (10 oz) package frozen chopped spinach, thawed and drained
10 ounces shredded Monterey Jack cheese
1 (8 oz) package cream cheese, softened
1 cup half-and-half cream
1 tablespoon red wine vinegar
Salt and pepper to taste

Preheat oven to 400 degrees. Sauté onion in skillet over medium heat in oil until softened, about 4 minutes. Stir in tomatoes and chiles, let cook 2 minutes. Transfer the mixture to a large bowl and stir in spinach, cheese, cream cheese, half-and-half, and vinegar. Season with salt and pepper to taste. Spoon mixture into shallow baking dish like a 9 inch quiche dish or pie plate. Bake ion the preheated oven until the dip is bubbly and the top is light brown, about 35 minutes.