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Export 9 ingredients for grocery delivery
Step 1
Preheat oven to 350 degrees F (175 degrees C). Grease and flour an 7x11-inch baking dish.
Step 2
Beat 1/2 cup sugar and 2 tablespoons margarine together in a bowl using an electric mixer until smooth and creamy. Mix eggs, 1 cup flour, baking powder, and salt into creamed margarine mixture; stir in vanilla. Pour batter into the prepared baking dish. Arrange plums, skin side-down, atop batter.
Step 3
Mix 1 cup sugar, 1/2 cup flour, 3 tablespoons margarine, and cinnamon together in a bowl until crumbly; spoon over batter and plums.
Step 4
Bake in the preheated oven until plums are softened, about 35 minutes.