Preheat oven to 350.

Beat together cream cheese and sour cream.

Fold in cheddar cheese, jalapenos and 1/2 cup Parmesan until well blended.

Spread mixture into a 1 1/2 quart baking dish.

In another bowl, mix together bread crumbs, butter and remaining 1/4 cup Parmesan.

Sprinkle bread crumb mixture over dip mixture.

Bake 20-25 minutes until topping is golden brown.

Serve with crackers or chips.