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Preheat your oven to 350 degrees F. Spray a 9-inch by 9-inch baking dish with non-stick cooking spray, and set aside.
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In a large mixing bowl, combine the cream cheese, mayo, onion, and garlic with a wooden spoon (or spatula) until evenly combined.
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Add the tomatoes and peppers; mix to combine.
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Add the mozzarella, Italian cheese, and 1/2 cup of the Parmesan cheese and stir until evenly mixed.
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Transfer the dip to your prepared baking dish and spread into an even layer. Sprinkle the rest of the parmesan cheese all over the top of the dip.
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Bake for 20 to 25 minutes, until the dip bubbling around the edges. If you want the top golden, you can turn your oven to broil for 1-2 minutes until your desired color is reached.
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Carefully removed from the oven. Serve warm with crostini or Wheat Thins crackers.