Preheat the oven to 350º Fahrenheit. Spray an 8x8 baking dish with cooking spray.
Pour the lemon curd into the baking dish. Add dollops of cream cheese on top of the lemon curd.
Melt butter. Add the lemon cake mix into a medium bowl. Pour the melted butter into the same bowl. Use a fork to mix until the mixture becomes crumbly.
Sprinkle the crumb topping over the lemon curd and cream cheese. Bake at 350º Fahrenheit for 45 minutes.