The secret to an ultra-moist cake with only 4 spoonfuls of each ingredient!

You’re describing a classic “4 Quarters Cake” or “Quatre-Quarts” in French. It’s incredibly simple and reliably moist because it uses equal weights of butter, sugar, eggs, and flour. Here’s how to make it:
Ingredients (4 spoonfuls = approximate measurements, but weighing is most accurate):

4 spoonfuls (or 100g) of Unsalted Butter, softened
4 spoonfuls (or 100g) of Granulated Sugar
4 spoonfuls (or 100g) of Eggs (about 2 large eggs)
4 spoonfuls (or 100g) of All-Purpose Flour
Optional: 1 teaspoon vanilla extract, lemon zest, or other flavorings
Instructions:
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