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Instructions
Preheat the oven to 350 degrees F (175 degrees C). Put rhubarb in an 8- or 9-inch round glass baking dish.
Mix sugar, flour, and eggs together in a medium mixing bowl; pour over rhubarb.
Prepare crumble in the same bowl: Mix flour, brown sugar, oats, baking powder, and salt until combined; mix in softened butter until well combined. Sprinkle crumble mixture over rhubarb.
Bake in the preheated oven until rhubarb is soft and top is browned, about 30 minutes.