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General
Mix flour, white sugar, baking powder, and salt. Rehydrate egg powder in ⅓ cup water. Combine with milk powder in 1½ cups water, vanilla, and melted butter. Stir wet into dry until combined. Pour into parchment-lined dutch oven. TOPPING: Cream softened butter with brown sugar, flour, and cinnamon. Drop spoonfuls over batter and swirl with a knife. Bake 35–45 minutes until a knife comes out clean. GLAZE: Mix icing sugar with a splash of water until pourable. Drizzle over warm cake.