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This recipe was uploaded by dawnrigoni
Sift or stir together flour, baking soda and salt; gradually stir in to butter mixture. Fold in yogurt and rhubarb. (note: the batter will seem very thick, almost like cookie dough; this is how it is supposed to be!) Spoon batter into greased and floured baking pan.
Stir together white sugar and spices; sprinkle over batter.
Bake at 350 degrees F (175 degrees C) for 40 minutes, or until tester comes out clean. (Mine only took 30 minutes because I used a large baking pan.)
Sprinkle with a little bit of powdered sugar.
Cut into squares when cool. (actually, i couldn't wait and cut a piece to try while it was still warm...sooo delicious!)