Heat oven to 350°F. In small saucepan, melt 1 cup chocolate chips over low heat; cool. In medium bowl, combine flour, baking powder, baking soda and salt; mix well. In large bowl, beat margarine and sugar with electric mixer until creamy. Blend in melted chocolate, egg and vanilla. Gradually add flour mixture; mix well. Stir in oats and remaining 1 cup chocolate morsels. Drop by rounded tablespoonfuls onto ungreased cookie sheet. Bake 12 to 14 minutes or until set. Cool 2 minutes on cookie sheet; remove to wire rack. Store tightly covered.
Serving Tips: Make bars instead of cookies! Heat oven to 375°F. Press dough evenly onto bottom of greased 13 x 9-inch baking pan. Bake about 25 minutes or until wooden pick inserted in center comes out clean. Cool completely in pan; cut into bars. Store tightly covered. Makes 32 bars.