Tart Shell Ingredients:
1/2 cup butter, softened
1 (3-ounce) package cream cheese, softened
3/4 cup all-purpose flour
1/3 cup sugar
1/4 cup unsweetened cocoa
3 (1-ounce) squares unsweetened baking chocolate
3 tablespoons butter
2/3 cup sugar
1 teaspoon vanilla
1 (1-ounce) square white chocolate
1/2 teaspoon shortening
Heat oven to 325°F. Combine 1/2 cup butter and cream cheese in small bowl. Beat at medium speed until smooth. Reduce speed to low; add all remaining shell ingredients. Beat until well mixed and forms a dough.
Shape dough into 24 (1 1/4-inch) balls with floured hands. Place one ball of dough into each ungreased mini muffin cup. Press dough evenly on bottom and up sides of muffin cup.
Melt baking chocolate and 3 tablespoons butter in small saucepan over low heat, stirring occasionally, until smooth (2 to 3 minutes). Remove from heat. Cool 5 minutes. Stir in all remaining filling ingredients until smooth.
Spoon filling into each shell. Bake for 26 to 28 minutes or until filling is set. Cool in pans 5 minutes. Carefully remove tartlets from pan. Cool completely on cooling racks over waxed paper.
Melt white chocolate and shortening in small microwave-safe bowl on HIGH (45 to 60 seconds). Stir until smooth; drizzle glaze over tartlets.