In a medium bowl combine flour, cocoa powder, and baking powder; set aside. In a large bowl beat butter with an electric mixer on medium speed for 30 seconds. Add the 1-1/2 cups sugar and the oil. Beat until combined. Beat in eggs and vanilla until combined. Beat in flour mixture. Cover and chill about 1 hour or until dough is easy to handle.
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For filling, in a small saucepan combine sweetened condensed milk, chocolate pieces, and chopped chocolate. Cook and stir over medium heat until chocolate melts; cool. Spread filling on bottoms of half of the cookies, using 1 rounded teaspoon per cookie. Top with remaining cookies, bottom sides down, pressing lightly together.
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