Instructions

  1. Preheat oven to 350°F.
  2. Line 8x8-inch baking pan with heavy foil extending beyond pan's edges.
  3. In a large bowl stir together oats, 1 cup flour, and brown sugar. Cut in butter until mixture resembles coarse crumbs.
  4. Set aside 1 cup oat mixture. Press remaining mix on bottom of prepared pan.
  5. Bake bottom crust for 25 minutes.
  6. Meanwhile, in a medium bowl stir together granulated sugar, 2 Tbsp flour, and ground ginger.
  7. Add rhubarb; toss to coat. Spread on hot crust. Sprinkle reserved 1 cup oat mixture on top and press lightly.
  8. Bake bars for 30-35 minutes, or until top is golden and filling is bubbly.
  9. Cool on a wire rack.
  10. When bars are cool, make the icing: In a small bowl stir together powdered sugar, ground ginger, and orange juice or milk.
  11. Drizzle icing over bars.
  12. Lift bars from pan, using foil as a sling. Cut into squares.
  13. Store, covered, in refrigerator.