Cinnamon-Brown Sugar Pop-Tart® Cake - cooking recipe

Ingredients

cooking spray
6 cinnamon-brown sugar toaster pastries (such as Pop-Tarts(R))
5 tablespoons unsalted butter, melted
3/4 cup brown sugar, divided
1 tablespoon all-purpose flour
4 teaspoons ground cinnamon, divided
1 teaspoon milk
1/2 cup unsalted butter, softened
1/2 cup white sugar
1 egg, separated
1 1/2 teaspoons vanilla extract
1 cup all-purpose flour
1 1/2 teaspoons baking powder
1/2 teaspoon salt
3/4 cup milk
1 1/2 teaspoons white vinegar
1 cup cream cheese frosting, or to taste

Preparation

Preheat oven to 325 degrees F (165 degrees C). Spray an 8-inch square pan.
Crumble 4 toaster pastries into a bowl and mix in melted butter; press into the prepared pan creating a crust.
Combine 1/4 cup brown sugar, 1 tablespoon flour, 1 teaspoon cinnamon, and 1 teaspoon milk in a bowl; spread over crust.
Beat 1/2 cup brown sugar, softened butter, and white sugar together in a bowl; add egg yolk and vanilla extract and mix well. Combine 1 cup flour, baking powder, and salt in a separate bowl. Whisk 3/4 cup milk and vinegar together in a separate bowl.
Mix flour mixture, alternating with milk-vinegar mixture, into butter mixture until batter is well mixed. Fold egg whites into batter. Crumble 1 toaster pastry over batter and fold. Pour batter over the crust.
Bake in the preheated oven until a toothpick inserted in the center comes out clean, 45 to 50 minutes. Cool cake completely, at least 1 hour.
Spread frosting onto cake and crumble 1 toaster pastry over frosting.