Choose cake flour with a fine texture and moderate protein for a tender crumb.

Check the package date before buying. Fresh flour matters. Weigh every ingredient with a digital scale, since measuring cups can vary considerably. Use room-temperature eggs, softened unsalted butter, and fine sugar. Cold ingredients may leave small butter lumps.

I learned this after one uneven cake.

Prepare the equipment before mixing.

A 20-centimeter round pan usually gives the batter enough room to rise evenly. Line its base with parchment, then lightly grease the sides. Use a clean mixing bowl, a flexible spatula, a fine sieve, and a wire cooling rack. An oven thermometer is useful because the displayed temperature may be inaccurate.

Mine once showed 180°C while the actual heat was lower.

Sift the cake flour with baking powder and salt, preferably twice.

This removes clumps and distributes the leavening more evenly. Set the pan on the middle rack, away from the oven walls. Preheat fully, but avoid opening the door during the early rise. A skewer should emerge with a few moist crumbs, not wet batter. I sometimes overbake by two minutes when distracted, so I now set a separate timer.

Temperature control is not glamorous, but it changes the texture.

Whisk the cake flour, baking powder, and salt in a dry bowl. In another bowl, beat softened butter and sugar until pale and slightly airy. Add eggs one at a time, scraping the bowl after each addition. Stir in vanilla, if desired. Add the dry mixture in three portions, alternating with milk in two portions. Mix slowly after each addition. Stop when no dry streaks remain. Do not chase perfect smoothness.

A few small lumps are acceptable. Overmixing is the common mistake. It can strengthen gluten and make the cake less tender, even with low-protein flour. Fold with a silicone spatula for the final turns, then spread the batter into a lined pan. The FDA Food Code advises cooking egg-containing foods thoroughly; use a clean thermometer and check that the center reaches at least 160°F when appropriate. Flour is also raw agricultural material, so never taste uncooked batter. I sometimes mix for ten seconds too long. That small error still teaches more than a flawless recipe.

A cake flour cake stays soft when stored correctly. Cool it completely before covering it. Otherwise, trapped steam can make the surface sticky. Keep an unfrosted cake in an airtight container at room temperature for up to two days. Cakes with cream, custard, or fresh fruit need refrigeration. Wrap chilled slices tightly, because cold air quickly dries delicate crumbs. For longer storage, freeze individual slices for up to one month. Thaw them while still wrapped.

Serve the cake slightly cool or at room temperature. The flavor becomes clearer after twenty minutes outside the refrigerator. Use a thin, sharp knife for cleaner slices. A few crumbs are normal. Cake flour creates a tender texture, but it can also make the cake fragile. Handle each layer gently when stacking. You can adapt the recipe with citrus zest, toasted nuts, or mashed banana. Reduce other liquids slightly when adding wet ingredients. My own test cake became too soft after adding extra banana. That mistake taught me to change one ingredient at a time.

Tips: Measure cake flour by weight when possible. Spoon it into a cup if you lack a scale. Do not pack it down. Check the center with a skewer, but avoid overbaking. Let the cake rest before slicing. Small adjustments matter.