Step 1: Preheat oven to 350 degrees Fahrenheit.
Step 2: Grease and flour a 9”x11” cake pan and line bottom with parchment paper.
Step 3: In large bowl, mix together 2 cups of flour and the baking powder.
Step 4: In separate bowl, mix together until creamy, eggs, oil and 1 cup of sugar.
Step 5: Pour over flour mixture and blend well.
Step 6: In large bowl, mix together rhubarb and remaining flour and white sugar. (Do not make this mixture ahead of time as the rhubarb will become very tollowy.)
Step 7: Pour batter over the rhubarb mixture and stir until rhubarb is covered with batter and pour into prepared pan.
Step 8: Mix brown sugar, oats and cinnamon together and sprinkle over top.
Step 9: Cook for 30 minutes or until center springs back.
Step 10: Let cool on wire rack 1/2 an hour before removing from pan.
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