Preheat your oven to 350°F (175°C). Lightly grease a 9×13-inch baking dish with nonstick spray or a thin coating of butter. Set the dish on a sturdy baking sheet if your pan is thin; this helps it bake evenly and makes it easier to move.
Spread the apple pie filling evenly in the bottom of the prepared baking dish. Use a spoon or spatula to nudge the apples into an even layer so every bite has some fruit. If the filling looks very thick, you can gently stir it in the pan to loosen it a bit.
If using, sprinkle the ground cinnamon and salt evenly over the apple pie filling. This gives the apples a little more warmth and keeps the sweetness from feeling too heavy, just like Grandma would do by instinct.
Open the box of spice cake mix and pour the dry mix evenly over the apples. Do not stir. Use your hands or the back of a spoon to gently spread the mix so it covers all the filling in a fairly even layer. Some little gaps are fine; they’ll bake up into toasty, buttery spots.
Slice the cold butter into thin pats, about 1/8 to 1/4 inch thick. Lay the butter slices over the surface of the dry cake mix, spacing them as evenly as you can. Try to cover as much of the top as possible—this is what creates that cinnamon-speckled golden crust with tender apple pockets beneath.
Place the baking dish (on the baking sheet, if using) into the preheated oven. Bake for 40–50 minutes, or until the top is deeply golden brown, you can see the apple filling bubbling up around the edges, and there are no dry powdery spots of cake mix on top. If a few corners look dry, you can gently poke them with a spoon to see if there’s melted butter underneath; if not, give it another 5 minutes.
Remove the pan from the oven and set it on a speckled granite or other heat-safe countertop to cool slightly. Let the dump cake rest for at least 10–15 minutes; this helps the filling thicken a bit so you get nice, cozy scoops instead of a runny puddle.
Serve warm, scooped out with a large spoon into bowls. If you like, top each serving with vanilla ice cream, whipped cream, or a drizzle of caramel. Store any leftovers covered in the refrigerator for up to 3 days, and rewarm individual portions in the microwave until just heated through.
Variations & Tips
To make this even more like Grandma’s Sunday dessert, you can tuck in a few little touches. For extra texture, sprinkle 1/2 to 3/4 cup chopped pecans or walnuts over the dry cake mix before adding the butter. If your crowd loves cinnamon, add up to 1 teaspoon total cinnamon, or a pinch of nutmeg or allspice, for a deeper, bakery-style aroma. For a slightly less sweet version, stir 1–2 tablespoons of lemon juice into the apple pie filling before spreading it in the pan; it brightens the flavor. You can also mix 1/2 cup old-fashioned oats with 2 tablespoons of the dry cake mix and 1 tablespoon melted butter, then scatter that over a portion of the top for a mock streusel. If you prefer a richer, almost cobbler-like texture, melt the butter instead of slicing it and drizzle it slowly and evenly over the entire surface of the cake mix, making sure to wet as much of the dry mix as possible. For smaller households, halve the recipe and bake it in an 8×8-inch dish, checking for doneness around 30–35 minutes. And if you ever find yourself out of spice cake mix, you can use yellow cake mix and stir 1–2 teaspoons of pumpkin pie spice or apple pie spice into the dry mix to keep that cozy, spiced flavor Grandma Ruth would insist on.
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