Put 1 cup of seedless blackberry jam in a pot and melt it on low (stirring occasionally)
Prepare baking dish with non-stick spray
Take 1 container of biscuits and cut each biscuit into 4 pieces (quarters)
Place the biscuit pieces on the bottom of the baking dish
Using your hands, separate the cream cheese into pieces and scatter it around with the biscuit quarters
Slowly pour the melted blackberry jam over the biscuit pieces and cream cheese
In the mixing bowl, whisk together the eggs, half and half, cinnamon sugar, and vanilla
Pour that mixture over the blackberry jam in the baking dish
Take your second container of Pillsbury biscuits and cut those biscuits into quarters as well
Scatter those biscuit pieces over the egg mixture.
Finally, top it all off by dusting everything with the brown sugar
Bake covered at 350 degrees for 30 minutes THEN bake uncovered at 350 degrees for another 30 minutes (60 minutes total).
Serve warm.