Preheat oven to 350F.
Spread diced jalapenos evenly on a baking sheet.
Roast in the oven for 8-10 minutes. Remove from the oven and set aside.
Raise oven temperature to 375F.
Mix together the cream cheese, sour cream, and garlic powder.
Mix in the Mexican cheese blend, shredded Parmesan, and jalapenos.
In a medium-size mixing bowl combine Ritz Cracker crumbs, melted butter, grated Parmesan cheese, and Italian seasoning.
Spread evenly over the jalapeno cheese mixture.