Greek yogurt is the secret to this rhubarb cake, producing a sweet and tangy batter. The crunchy topping--spiced with nutmeg and ginger--gives off serious coffee cake vibes. It's perfect for breakfast with a mug of tea and makes a showstopping and delicious dessert for a dinner party.
For the crumb topping: Combined the flour, brown sugar, oats, ginger, salt and nutmeg in a small bowl. Add the butter and mix thoroughly with your fingers or a fork until all the butter has been evenly distributed and incorporated into the flour. Form into small to medium clumps with your fingers. Set aside.
For the cake: Preheat the oven to 350 degrees F. Butter an 8-inch square cake pan.
Whisk together the flour, baking powder, baking soda and salt in a medium bowl.
Beat the butter and granulated sugar together in a large bowl with an electric mixer (or using a stand mixer fitted with a paddle attachment) on medium-high speed until light and fluffy, about 3 minutes. Add the eggs one at a time, beating well after each addition. Beat in the vanilla.
Reduce the mixer speed to low and mix the flour mixture in 3 parts, alternating with the Greek yogurt in 2 parts, beginning and ending with the flour and beating until just incorporated. Fold in the rhubarb using a rubber spatula. Take care not to overmix the batter.
Spoon the batter (it will be thick) into the prepared pan and smooth with an offset spatula. Sprinkle on the crumb topping, distributing it evenly.
Bake until the topping is golden brown and a toothpick inserted into the center of the cake comes out with just a few moist crumbs, 1 hour to 1 hour 10 minutes. Let the cake cool completely in the pan on a wire rack, about 1 hour.
When measuring flour, we spoon it into a dry measuring cup and level off excess. (Scooping directly from the bag compacts the flour, resulting in dry baked goods.)
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