A simple springtime snacking cake with a tender vanilla base, pockets of tart pink rhubarb, and a generous cinnamon crumb topping. Perfect with coffee, perfect for Mother's Day, perfect anytime you have rhubarb and want something sweet and snacky.
Preheat the oven to 350°F. Lightly grease a 9-by-13-inch pan.
Make the crumb topping: In a small mixing bowl, mix the flour, sugars, cinnamon, and baking powder. Cut in the coconut oil with your fingers or a pastry cutter to form nice large crumbs. Some of the topping will still be sandy and that's fine, just so long as you have mostly big crumbs.
Make the cake: In a large mixing bowl, mix the milk, oil, applesauce, vanilla, and vinegar. Sift in the flour, sugar, baking powder, and salt and mix until smooth. Fold in the rhubarb.
Pour the batter into the prepared pan. Evenly sprinkle on the crumb topping and pat it down just a bit. Bake until a knife inserted in the center comes out clean, 40 to 45 minutes. Let cool for at least an hour before slicing. If desired, sift powdered sugar over the top.
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