Pineapple dump cake is one of the easiest desserts to make. Just as the name states, all you do is "dump" the ingredients into a dish and bake until it's bubbly and golden brown.
Add the pineapple (with juices) to a 9 by 13-inch casserole dish, spreading it out evenly.
Sprinkle the brown sugar on top of the pineapple.
Sprinkle the cake mix on top, spreading it around evenly.
Pour the melted butter on top of the cake mix, spreading it out as evenly as possible.
Bake (uncovered) until the sides are bubbling and the top is golden, about 1 hour. Serve warm.
Notes
Bump up the flavor by adding 1 teaspoon of vanilla extract (drizzle it around the pineapple).
If you can’t find crushed pineapple, you can use 2 (20 ounce) cans pineapple tidbits in pineapple juice instead. If you can only find canned crushed pineapple in heavy syrup (instead of in pineapple juice), you can use that and simply omit the brown sugar.
If adding chopped pecans, add them in with the brown sugar in step 3.