Ingredients 1-7 are for the cake. Ingredients 8-11 are for the topping.
Preheat the oven to 350° F (175 degrees C). Grease and flour a 9x13 inch baking dish. In a large bowl, stir together the sugar, baking soda, salt and 2 cups flour. Stir in the eggs and sour cream until smooth, then fold in the rhubarb. Pour into the prepared dish and spread the batter evenly. In a smaller bowl, stir together the topping ingredients until the mixture is crumbly. Sprinkle the mixture on top of the batter and then dust lightly with cinnamon or cinnamon sugar.
Bake in the preheated oven until a toothpick inserted in the center comes out clean, about 45 minutes.
Serve with fresh whipped cream or ice cream.
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