Gooey Butter Cake

Name: Gooey Butter Cake
Prep time: 10 min
Total time: 10 min
Cuisine: American
Ingredients: Cooking spray; 1 box vanilla cake mix; 6 tbsp. butter, melted; 1 large egg; 1 (8-oz.) package cream cheese, softened; 1/2 c. (1 stick) butter, melted; 2 large eggs; 2 tsp. pure vanilla extract; Pinch of kosher salt; 1 (16-oz.) box powdered sugar, plus more for garnish