
Hot milk cake is one of those old-fashioned, humble desserts that somehow tastes more special than the ingredient list suggests — tender, lightly golden, and just sweet enough to feel like a treat. The magic happens when you pour a hot mixture of steaming milk and melted butter straight into the batter, creating a silky, pourable consistency that bakes up incredibly soft. Traditional versions rely on eggs to bind and lift the crumb, but here a flax egg — just ground flaxseed stirred into water until it thickens into a gel — steps in seamlessly, so the texture stays moist and cohesive without any compromise. It's a genuinely clever swap that requires no specialty products, just a few extra minutes of patience while the flaxseed does its thing. The whole cake comes together in one bowl and a single saucepan, which makes cleanup almost as satisfying as the bake itself. Cut into 9 squares and dusted with a little powdered sugar, it's the kind of simple, crowd-pleasing dessert you'll find yourself returning to again and again.
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Stir together the ground flaxseed and water in a small bowl until combined. Set aside for 10 minutes, until the mixture thickens to a gel-like consistency.
Preheat the oven to 350°F (175°C). Grease a 9×9-inch baking pan and line the bottom with parchment paper.
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