
Brown butter is one of those techniques that feels almost too good to be true — and pulling it off without any dairy is genuinely exciting. Vegan butter browns just like the real thing when you give it enough time over medium heat, developing that deep amber color and irresistible nutty aroma that makes this cake taste far more complex than a simple weeknight bake has any right to. A flax egg stands in for the binding work, and a splash of apple cider vinegar in the plant-based milk gives the batter a subtle tang that keeps every bite tender and moist. The glaze gets the same browned-butter treatment, so you're layering that toasty flavor twice — once in the cake, once poured warm over the top. A finish of flaky sea salt is optional but honestly not optional. The whole thing bakes into 9 generous squares, making it an easy choice for sharing at a gathering or keeping on the counter all week. It's the kind of dessert that makes people ask for the recipe before they've even finished their first piece.
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Preheat the oven to 350°F (175°C). Grease a 9×9-inch baking pan and line the bottom with parchment paper.
Stir together the ground flaxseed and 3 tbsp water in a small bowl and set aside for 5 minutes, until the mixture thickens to a gel.
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