Mix 1 cup flour and confectioners' sugar together in a bowl; cut butter into flour mixture using a pastry cutter or two forks until mixture is crumbly. Press flour-butter mixture into an 8-inch square pan.
Bake crust in the preheated oven until golden brown, 15 to 20 minutes.
Mix white sugar, 1/4 cup flour, baking powder, and nutmeg into the beaten eggs. Fold rhubarb into egg mixture; pour rhubarb filling into the baked crust.
Bake in the preheated oven until filling is bubbling, 35 minutes.
Nutritional Facts
Per 12 servings
Calories: 243
Carbohydrate: 40g
Fat: 9g
Fiber: 1g
Protein: 3g
Sugar: 29g
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