Preheat Oven and Prepare Baking Dish:
Preheat your oven to 350°F (175°C).
Grease a 9x13 inch baking dish.
Layer Raspberries:
If using fresh raspberries, mix them with brown sugar in a bowl.
Spread the raspberries evenly in the bottom of the prepared baking dish.
Add Cake Mix:
Sprinkle the dry vanilla cake mix evenly over the raspberries.
Add Butter and Vanilla:
Drizzle the melted butter evenly over the dry cake mix.
Sprinkle vanilla extract evenly over the cake mix and butter.
Top with White Chocolate Chips:
If using, sprinkle white chocolate chips evenly over the top.
Bake:
Bake in the preheated oven for 45-50 minutes, or until the top is golden brown and the filling is bubbly.
Cool and Serve:
Allow the cake to cool for a few minutes before serving.
Serve warm, optionally with whipped cream or vanilla ice cream.
Preparation time: 10 minutes | Cooking time: 45-50 minutes