For tart-shells, beat butter and cream cheese in bowl until smooth. Add flour, mix until a soft dough forms. Cover; chill at least 1 hour or overnight. Preheat oven to 350 degrees. Shape dough into 1 inch balls. Place balls of dough into ungreased mini-muffin pan. Dip a mini-tart shaper in flour; press into dough to form tart shell. For filling, combine all ingredients in bowl; mix well. Fill tart shells evenly with filling mixture. Bake 20-25 minutes or until light golden brown. Remove from mini-muffin pan to cooling rack. Cool completely. Sprinkle with powdered sugar if desired.
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