Preheat oven to 375 degrees F. Grease a cookie sheet or cover with parchment paper.
Chop half of the 8 oz. of white chocolate baking bar and set aside.
In a pan, melt the rest of the unchopped white chocolate over medium heat. Cool.
In a bowl, mix the butter with sugar, until combined. Add in eggs and melted white chocolate baking bar. Mix until combined
Beat in the flour, baking soda and salt until combined and then stir in the chopped white baking bar.
Place dough, by the spoonful onto prepared baking sheet, 2 inches as part and bake for 7-9 minutes or until lightly browned around the edges. Cool on wire rack.
Spoon a 1/2 tsp of jam onto each cooled cookie.
In a heavy pan, melt the 4 oz. of white chocolate baking bar and oil. Stir until melted and combined well.
Drizzle chocolate mixture over each cookie. Refrigerate to firm up.