Ingredients

  • 1/3 cup packed brown sugar
  • 1/4 cup all-purpose flour
  • 1/4 cup quick-cooking oats
  • 2 tablespoons butter, softened
  • 1/2 teaspoon ground cinnamon
  • 1-1/2 cups quick-cooking oats
  • 1 cup all-purpose flour
  • 3/4 cup whole wheat flour
  • 1-1/4 teaspoons ground cinnamon
  • 1 teaspoon baking powder
  • 1 teaspoon baking soda
  • 1/2 teaspoon salt
  • 1/4 teaspoon ground nutmeg
  • 1/3 cup butter, softened
  • 1 cup packed light brown sugar
  • 1-1/2 teaspoons vanilla extract
  • 2 large eggs
  • 1/3 cup reduced-fat sour cream
  • 2-1/2 cups shredded zucchini (about 2 medium)
  • Confectioners' sugar

Method

  • Preheat oven to 350°. Coat a 10-in. fluted tube pan with cooking spray; dust lightly with flour, tapping out excess.
  • Mix first five ingredients with a fork until crumbly. Sprinkle onto bottom of prepared pan.
  • For batter, mix oats, flours, cinnamon, baking powder, baking soda, salt and nutmeg. In another bowl, beat butter and brown sugar until crumbly; beat in vanilla and eggs, one at a time. Add oat mixture alternately with sour cream, beating well (batter will be thick). Fold in zucchini. Pour over crumb mixture.
  • Bake until a toothpick inserted in center comes out clean, 35-40 minutes. Cool 10 minutes before removing to a wire rack. Serve warm or at room temperature; dust with confectioners' sugar before serving.