Preheat your oven to 350°F (175°C).

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

Stir in the shredded mozzarella, cheddar, and grated Parmesan cheese until fully integrated.

Fold in the diced green onions, diced red bell pepper, garlic powder, onion powder, Italian seasoning, and season with salt and pepper to taste.

Transfer the dip mixture into a lightly greased baking dish and spread it evenly.

Bake for 25-30 minutes until bubbly and golden brown on top.

Let cool for 5-10 minutes before serving warm with tortilla chips, crackers, or fresh veggies.