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Combine graham crackers with brown sugar and melted butter.zSB(3,3)
In a mixing bowl, beat cream cheese until fluffy; beat in sugar and then the eggs. Beat in vanilla just until blended.
Melt chocolate in a bowl or double boiler insert over simmering water.
Put about 1/3 the cream cheese batter in a separate bowl; stir in peanut butter until blended. To the other half of the cream cheese, add the melted chocolate.
Spoon about 1 heaping tablespoon of the peanut butter batter into each muffin or mini cheesecake cup. Spoon about 1 1/2 to 2 teaspoons of the chocolate batter over the peanut butter batter. Gently swirl the chocolate batter into the peanut butter batter with a toothpick or small spatula.
Bake for 20 to 24 minutes, or until set.
Cool in pan on a rack then chill thoroughly before removing from cheesecake pan.
Makes about 24 mini cheesecakes.