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Preheat the oven to 350 degrees F (180 degrees C).
Line a 9x13 baking pan with parchment paper and allow excess paper to hang slightly over the edges for easy removal after baking.
Spray parchment with baking spray.
Place sweet potatoes in a large mixing bowl and beat with an electric mixer until mostly smooth.
Add cake mix, 2 eggs, butter, 1 teaspoon vanilla extract, and cinnamon to the bowl and mix well.
Add cake batter to the prepared pan and spread evenly.
Combine powdered sugar, cream cheese, remaining 2 eggs, and remaining vanilla extract in a separate bowl; mix well and pour over the top of the cake batter.
Bake cake in preheated oven until set around the edges and just beginning to pull away from the sides, and slightly jiggly in the center, 30 to 35 minutes.
Let cake cool completely in the pan to allow layers to settle before cutting into squares.