Yield
12 servings (serving size: 1 piece)
Photo: Becky Luigart-Stayner; Styling: Jan Gautro

How to Make It

Step 1

Preheat oven to 375°.

Step 2

To prepare cake, combine rhubarb and 2 tablespoons flour in a medium bowl; toss well to coat.

Step 3

Place brown sugar and 5 tablespoons butter in a large bowl; beat with a mixer at medium speed until light and fluffy. Add eggs, 1 at a time, beating well after each addition. Add sour cream, rind, and vanilla; beat until well combined.

Step 4

Lightly spoon 1 1/2 cups all-purpose flour and whole wheat flour into dry measuring cups; level with a knife. Combine flours, baking soda, 1 teaspoon cinnamon, and salt, stirring with a whisk. Gradually add flour mixture to butter mixture, beating at low speed just until combined. Fold in rhubarb mixture. Spread batter into a 9-inch square baking pan coated with cooking spray.

Step 5

To prepare streusel, combine turbinado sugar and 1/2 teaspoon cinnamon in a small bowl. Cut in 2 tablespoons butter with a pastry blender or 2 forks until mixture is crumbly; stir in nuts. Sprinkle streusel evenly over batter. Bake at 375° for 50 minutes or until a wooden pick inserted in the center comes out clean.

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