You will need:
3 tbsp unsalted butter
4 cps mini marshmallows
6 cps Rice Krispies
White chocolate (to be "grated" like cheese).
Melt the butter in a large saucepan.
Measure out the marshmallows while the butter is melting.
Add the marshmallows and stir frequently.
Make sure all of the marshmallows are melted.
Then add the Rice Crispies. Stir until all of them are fully coated. Then you will put them into a "deep dish" pie pan (I used a 9" cake pan). To smooth our the surface, and give the "crust" more definition, I used a smaller pan to sort of push onto the treat. It worked quite well. :)
After the rice crispies are cooled, spread the raspberry preserves onto it, I used about 1/3 of an 11 ounce jar. Add the grated white chocolate, and spread like you would cheese on a pizza.
Then place the blackberries in a decorative fashion.