Grease a cake pan and preheat your oven to 350°F (175°C).
Make a large bowl by combining cake flour, sugar, baking powder, and salt.
Combine the egg whites, milk, and vanilla extract in a separate bowl.
Beat together the dry ingredients and wet ingredients until smooth. The batter should be smooth after adding the room-temperature butter.
Bake the cake batter for approximately 30 minutes in the greased cake pan. When the cake is done, insert a toothpick into the center of the cake and if it comes out clean, it is ready to be taken out of the oven.
Slice the cake into two equal layers after it has cooled completely.
Using a handheld mixer, whip the heavy whipping cream until soft peaks form while the cake is cooling.
Whisk in the sugar, cream of tartar, and vanilla extract to the whipped cream.
Make the strawberry sauce by combining strawberries, sugar, and water in a small saucepan. Strawberries should be heated until they release their juices.
On top of the strawberry sauce, spread whipped cream between the two cake layers.
Repeat the process with the second cake layer and another layer of whipped cream.
Serve the cake with additional strawberries as a garnish.
You're going to love your homemade Olive Garden Strawberry Cream Cake!