Good-Cooking - Killer Cupcakes

Ingredients

• 4 (1 ounce) squares semisweet chocolate
• 1 teaspoon vanilla extract
• 1/2 pound butter
• 4 eggs
• 1 1/2 cups granulated sugar
• 1 cup all-purpose flour
• 8 ounces cream cheese, softened
• 1/4 cup granulated sugar
• 1 egg, beaten
• Dash of salt
• 3/4 cup semisweet chocolate chips