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Step 1
Preheat oven to 350°. Prepare cake batter according to package directions. Pour into a greased 13x9-in. baking dish. Sprinkle with rhubarb and sugar. Slowly pour cream over top.
Step 2
Bake until golden brown, 40-45 minutes. Cool on a wire rack for 15 minutes before serving. Garnish with whipped cream and mint if desired. Refrigerate leftovers.