1. Preheat oven to 350°F.
2. Place muffin starters in a 9x9-inch baking dish prepared with cooking spray. Press to flatten.
3. Blend cream cheese, sugar, eggs and vanilla. Spoon over muffin starters.
4. Stir together blueberries and corn starch. Pour over cream cheese mixture.
5. Cut blueberries into cream cheese mixture with a knife in marble swirl.
6. Bake 25-30 minutes or until filling has set.