Place sliced strawberries in a food processor until smooth.
Combine flour, baking powder, and salt, stirring with a whisk.
Place stevia and ½ cup butter in a large bowl; beat with a mixer at medium speed until well blended. Add eggs, one at a time, beating after each addition. Beat in egg whites.
Add flour mixture and buttermilk alternately to butter mixture.
Add pureed strawberries and food colouring; beat just until blended.
Divide batter between 2 (8-inch) round cake pans coated with cooking spray.
Bake at 350° for 30 minutes or until finished.
Let cool for 10 minutes. Remove from pans and cool.
Place cream cheese, butter, and liqueur in a medium bowl; beat with a mixer at medium speed until blended. Gradually add powdered stevia, and beat just until blended.
Place 1 cake layer on a plate; spread with ½ cup frosting. Top with remaining cake layer. Spread remaining frosting over top and sides of cake.
Cut strawberry into thin slices and place/fan strawberry on top and sides of cake just before serving.
Recipe by Flavilicious Fitness at https://flaviliciousfitness.com/2014/04/17/easy-strawberry-cake-recipe/