Heat your oven to 350°F (175°C) and grease a cake pan.
In a big bowl, mix cake flour, sugar, baking powder, and salt.
In a separate bowl, blend egg whites, milk, and vanilla extract until smooth.
Mix the dry stuff with the wet stuff until it's smooth. Add soft butter and keep mixing until the batter is smooth.
Pour the cake mix into the greased pan and bake for around 30 minutes. To check if it's done, poke it with a toothpick in the center; if it comes out clean, the cake is ready.
Let the cake cool down completely, then cut it into two equal parts.
While the cake cools, make the cream filling. Whip the heavy cream with a handheld mixer until it's a bit fluffy.
Add sugar, cream of tartar, and vanilla extract to the whipped cream, and keep whisking.
To make the strawberry sauce, cook the strawberries, sugar, and water in a small pot until they become soft and juicy.
Spread the whipped cream between the cake layers and put the strawberry sauce on top.
Put the second cake layer on top and do the same with more whipped cream and strawberries.
Decorate the cake with extra strawberries. It's ready to eat.
Enjoy your homemade Olive Garden Strawberry Cream Cake!