Preheat your oven to 325°F and have a 10-inch tube pan ready (don't grease it). Sift together cake flour and 3/4 cup of the granulated sugar four times, which sounds like a lot but really does make the texture lighter. Set this dry mixture aside in a bowl.

Pour your room-temperature egg whites into a large mixing bowl. Add cream of tartar and salt, then beat on medium-high speed for about 3 minutes until soft peaks form (they'll look cloudy and bubbly).

Gradually add the remaining 3/4 cup sugar while beating continuously. This takes about 5 minutes and you'll see the egg whites transform into glossy, stiff peaks — this is the magic moment and I always get a little excited watching it happen.

Fold in vanilla extract gently with a rubber spatula. Then add the flour mixture in four batches, folding carefully each time so you don't deflate all those bubbles you just created (the goal is keeping it super fluffy).

Pour the batter into your tube pan and smooth the top with a spatula. Bake for 40 minutes until golden brown on top and a toothpick inserted comes out clean.

Remove from the oven and immediately invert the pan onto a cooling rack. Seriously don't skip this step — it prevents the cake from collapsing as it cools. Let it sit upside down for at least 2 hours or until completely cooled.

Once cooled, run a thin knife around the edges and center tube to loosen it. Pop it out gently onto a serving plate, then top with fresh berries and dust with powdered sugar right before serving for your cozy berry dessert.