Preheat your oven to 350°F (175°C). Lightly grease a 9x13 inch baking dish.
In a medium bowl, combine the melted butter and the yellow cake mix. Stir until just combined. Press about two-thirds of this mixture evenly into the bottom of the prepared baking dish.
In another bowl, beat the softened cream cheese and granulated sugar until smooth. Beat in the egg until well combined.
Spread the cream cheese mixture evenly over the cake mix layer in the baking dish.
Pour the strawberry pie filling evenly over the cream cheese layer.
Sprinkle the remaining cake mix mixture over the strawberry layer.
Bake for 45-55 minutes, or until the topping is golden brown and the filling is bubbly.
Let the dump cake cool for at least 15 minutes before serving. Serve warm.
Notes
For an extra creamy texture, you can add a swirl of whipped cream on top when serving.