This white cake with strawberry filling is layered with moist white cake layers, a fresh strawberry filling, and smooth vanilla buttercream, for a wonderful fresh dessert!
Measure out milk in a liquid measuring cup. Add egg whites and whisk to combine. Alternate adding milk mixture and dry ingredients into the cake batter, starting and ending with the milk mixture. Mix until just combined after each addition.
Mash the berries with a potato masher or a fork.Continue cooking and stirring until the filling thickens. Add lemon juice and salt and stir to combine.
Place one cake layer on a serving plate. Pipe a ridge around the top of the cake with buttercream frosting, to keep the strawberry filling from oozing out of the cake.