Preheat oven to 300°. Line 13 X 9 inch pan with heavy foil, set aside.
Combine crumbs and butter, press firmly on bottom of pan. With mixer, beat cream cheese in a bowl until fluffy. Beat in milk until smooth. Add eggs and vanilla, mix well. Pour half the batter over crust.
Stir melted chocolate into remaining batter, spoon over vanilla batter. With knife, swirl chocolate batter through vanilla batter to marble.
Bake 50 minutes or until set. Cool. Chill 1 hour.
Use foil to lift out of pan.
For hearts, cut with a heart shaped cookie cutter. Or, cut into bars.
Makes 12 hearts.
Please Note: Nutritional values listed may vary from final results depending on actual measurements and brands used to prepare the recipe.