Instructions

• Preheat oven to 350°F. Grease a 9x13-inch baking pan and set aside.
• In a large bowl, combine the yellow cake mix, apple pie filling, vanilla extract, ½ teaspoon cinnamon, eggs, and milk.
• Using an electric mixer (or a sturdy spoon), mix just until the ingredients are evenly combined and no large streaks of dry cake mix remain.
• Spread the batter mixture evenly into the prepared 9x13 pan.
• Wipe out the mixer bowl (or use a second large bowl). Add the granulated sugar, packed brown sugar, ½ teaspoon salt, 1½ teaspoons cinnamon, melted and slightly cooled butter, and all-purpose flour.
• Mix with an electric mixer on low-to-medium speed (or stir with a spoon) until the mixture forms coarse crumbs.
• Sprinkle the crumb mixture evenly over the batter in the pan, starting at the edges and working toward the center so the top is fully covered.
• Bake in the preheated oven for 35 to 45 minutes, until the top is golden and a toothpick inserted into the center comes out with moist crumbs but no wet batter.
• Remove the pan from the oven and let the cake cool on a wire rack for at least 15–20 minutes before slicing and serving.