Marbled Cheesecake Bars
["2 c. finely crushed Oreo cookies (approximately 24 cookies)", "3 Tbsp. margarine or butter", "3 (8 oz.) pkg. cream cheese, softened", "1 (14 oz.) can sweetened condensed milk", "3 eggs", "2 tsp. vanilla extract", "2 (1 oz.) sq. unsweetened chocolate, melted"]
["Preheat oven to 300\u00b0.", "Melt margarine in 13 x 9-inch baking pan in oven.", "After margarine is melted, remove from oven.", "Press crushed Oreo cookies firmly and evenly.", "In large mixer bowl, beat cheese until fluffy.", "Gradually beat in sweetened condensed milk until smooth.", "Add eggs and vanilla; mix well.", "Pour half of the batter evenly over prepared crust.", "Stir melted chocolate into remaining batter; spoon over vanilla batter.", "With table knife or spatula, gently swirl through batter to marble.", "Bake 45 to 50 minutes or until set.", "Cool.", "Chill.", "Cut into bars.", "Store covered in refrigerator."]
["Oreo cookies", "margarine", "cream cheese", "condensed milk", "eggs", "vanilla extract", "unsweetened chocolate"]