Prepare your strawberries by hulling and slicing them into halves or quarters, depending on size. Arrange the sliced strawberries in a bowl and set aside.
Slice or cube the sponge cake into approximately 1-inch pieces, making sure they're sizable enough to hold their shape but small enough to layer easily.
Start by placing a layer of cake pieces at the bottom of each serving plate or bowl, spreading them out evenly.
Top the cake layer generously with sliced strawberries, distributing them evenly across the surface, letting some juices seep into the cake.
Repeat the layering process: add another layer of cake pieces followed by more strawberries, until the bowl is filled, ending with a strawberry layer on top.
Sprinkle the top with a light dusting of powdered sugar if desired, adding a touch of sweetness and visual contrast.
Allow the assembled dessert to sit for about 10 minutes, giving the strawberries time to release their juices and soak into the cake, softening it slightly.
Serve the strawberry spoon cake with a spoon, revealing the layered, juicy strawberries and tender cake inside.