Preheat the oven to 350˚F and line the bottom of a 9-inch round cake pan with parchment paper.
Chill a large mixing bowl in the freezer.
Add 3 large eggs to the chilled bowl and beat on high speed for 1 minute.
Gradually add 1/2 cup granulated sugar and continue beating for 8 minutes.
In a small bowl, whisk together 1/2 cup flour and 1/2 tsp baking powder, then sift into the whipped eggs in thirds, folding gently.
Fold in 1/2 tsp vanilla extract just until blended.
Pour the batter into the prepared cake pan and bake for about 25 minutes.
Let the cake rest in the pan for 3 minutes, then run a spatula around the edges and invert onto a wire rack.
In a measuring cup, combine 3 Tbsp raspberry jam with 1 1/2 Tbsp hot water and stir until smooth.
In the chilled mixing bowl, add 1 cup heavy whipping cream and beat on high until stiff peaks form.
Add 4 Tbsp white chocolate instant pudding and 3 Tbsp powdered sugar, mixing well.
Spread half of the frosting over the cake and arrange berries on top.
Brush the glaze over the berries and pipe the remaining frosting around the top edge.
Serve the cake right away or refrigerate until ready to serve.