Preheat your oven to 350°F (175°C).

In a large mixing bowl, combine softened cream cheese, sour cream, and mayonnaise. Mix until smooth and creamy.

Stir in shredded mozzarella, cheddar, and Parmesan cheeses until evenly incorporated.

Fold in diced green onions, red bell pepper, garlic powder, onion powder, Italian seasoning, salt, and pepper.

Transfer the dip mixture to a baking dish, spreading it out evenly.

Bake in the preheated oven for 25-30 minutes until bubbly and golden brown.

Allow to cool for a few minutes before serving warm with tortilla chips, crackers, or veggie sticks.