Preheat the oven to 350°F and lightly grease an 8-inch round baking dish.
Beat the butter until fluffy then beat in the eggs, sweeteners, and vanilla extract until well combined.
Sift the almond flour, protein powder, psyllium husk powder, baking powder, and a pinch of salt over the wet ingredients and stir into a smooth batter.
Spread the batter in the prepared dish and bake for 25 to 30 minutes until golden brown.
Cool the cake completely then turn out and slice it into two even layers.
Slice the strawberries as thin as possible and spread them in a single layer over one cake layer.
Top with whipped cream and the second cake layer.
Pipe with additional whipped cream, if desired, and slice to serve.