Best Gooey Butter Cake Recipe

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