Preheat the oven to 350 degrees
Place the cream cheese and sour cream in the casserole dish and bake for 20 -25 minutes. This softens the cream cheese and makes it so much easier to stir in all the other ingredients.Set aside after it's done.
While the cream cheese is in the oven, In a medium to large saute pan, cook the chicken sausage until no longer pink, about 5-7 minutes. Break the chicken sausage into small pieces as it cooks. After it cooks place into the casserole dish with cream cheese and sour cream.
In the same saute pan, heat olive oil over medium heat, then add the banana peppers and cook for 3-5 minutes or until softened and fragrant. Stir in the garlic and saute for another 1-2 minutes.
Place the banana peppers garlic, gorgonzola, and grated parmesan in with the cream cheese, sour cream, and sausage.
Taste for seasoning. If it needs salt stir in 1/4 teaspoon at a time. I never use more than 1/2 teaspoon of salt.
Bake for another 30 minutes.
Let it sit for about 5 minutes and then serve with bread, crackers, vegetables, or all of the above.