Preheat oven to 325 degrees. Grease and flour an 8 inch square baking pan.
Melt butter and pour into large mixing bowl. Add sifted cocoa and sugar. Stir to combine.
Add salt, vanilla, and eggs. Stir until well-incorporated.
Finally add sifted flour and stir until just incorporated. Batter will be thick.
Spoon batter into baking pan and spread out evenly using a spatula.
Heat raspberry jam in microwave for about 30 seconds. Using a spoon, place several dollops of jam evenly over the brownie batter. Using a toothpick, swirl jam to distribute.
Bake for 20-25 minutes. Allow to cool on baking rack before serving.