Preheat oven, and heavily grease and flour you pan.

Cream butter in a large mixing bowl. Gradually add sugar, beating well at medium speed.
Add Eggs, one at a time , beating after each addition.
Dissolve soda in buttermilk, stirring well.
Add to creamed mixture alternately with flour, beginning and ending with flour.
Add 1 cup mini-morsels, melted chocolate, chocolate syrup and vanilla, stirring just until blended - do not overbeat.
Spoon batter into prepared pan, bake until Decadent Fudge Cake springs back when touched.
Invert cake immediately onto a serving plate, and let cool completely.
Combine 4 oz. white chocolate and 2 Tbsp shortening in top of a double boiler.
Cook until mixture is melted and smooth.
Remove from heat.
Drizzle melted white chocolate mixture over cooled cake.
Melt remaining 1/2 cup mini-morsels and 2 tsp shortening in a double boiler.
Remove from heat - let cool: Drizzle over white chocolate.