Grease a 13 x 9 x 2 inch baking dish; set aside

In a very large bowl, stir together the dry cake mix and rolled oats. Stir in the melted butter until mixture is crumbly. Press 1/2 of the crumb mixture evenly into the prepared dish.

In a small bowl, combine the jam and the lemon juice. Spread the jam mixture over the crumb crust to within 1/2 inch of the edges.

Add 1/2 cup white chocolate chips to remaining crumb mixture, combine. Sprinkle the remaining crumb/white chocolate chip mixture evenly over the top

Bake in a 375º oven for 20 to 25 minutes or until golden brown.

Cool in baking dish on a wire rack.

Make Lemon Glaze:

In a small bowl, whisk together powdered sugar and lemon juice until you reach desired consistency. Drizzle with Lemon Glaze.