Cream butter and cream cheese with electric mixer. Add sugar and cream well. Beat in vanilla and lemon rind. Add eggs one at a time, beating well after each addition. Sift flour with baking powder and blend in. Toss gumdrops with the 1/2 cup of flour. Stir into batter. Pour into greased and floured 10 in Bundt or tube pan. Bake at 300 deg. for 70-80 minutes or until toothpick inserted in centre comes out clean. Cool in pan 10 minutes, them turn out on wire rack to cool. I find if you freeze before slicing you get nicer looking slices.