Preheat oven to 350 whip cream cheese with lemon juice and vanilla until smooth. Beat in eggs. Add milk and butter and blend well. Combine dry ingredients and beat into cream cheese mixture until well mixed. Fold in blueberries and pour mixture into greased muffin tins 3/4 full, sprinkle tops with sugar/cinnamon mixture. Bake for 30 minutes or until a tester inserted in middle comes out clean.