Preheat your oven to 350°F (175°C). Grease and flour the cake pans.
Combine dry components: Combine the flour, baking powder, and salt in a sieve and sift them together to ensure they are well mixed. Set aside.
Whip the butter and sugar: In a sizable mixing bowl, whisk the butter and sugar together until they become light and airy.
Add eggs and vanilla: Beat in eggs, one at a time, then stir in the vanilla.
Combine mixtures: Alternately add the dry ingredients and milk to the butter mixture, starting and ending with the flour mixture.
Fold in strawberries: Gently fold in diced strawberries.
Baking the cake: Transfer the cake mixture to your greased pans and bake at the preheated temperature for 25-30 minutes, or until a toothpick inserted into the middle of the cake comes out without any wet batter.
Cool: Allow cakes to cool in the pans for 10 minutes, then turn out onto a wire rack to cool completely.
Assemble the cake: Spread strawberry jam between the layers, then cover the top and sides with whipped cream. Garnish with sliced strawberries.