Pineapple Casserole Recipe
Active time: 30 minutes
Total time: 1 hour
Preheat oven to 350°. Lightly butter a 9" square or round baking dish or pan. On a large rimmed baking sheet, arrange cornbread crumbs and toast, stirring halfway through, until dried and golden brown, 8 to 10 minutes. Meanwhile, in a small pot, heat butter over medium heat until the solids are golden brown and the butter has a nutty fragrance, about 5 minutes. In a medium bowl, carefully toss together cornbread crumbs and butter; set aside.
In another medium bowl, stir together mayonnaise, pimentos, onion and jalapeño. Add cheese, cayenne and white pepper, and stir again until combined.
In a large bowl, stir together sugar and flour until very well incorporated, then fold in pimento cheese mixture. Put pineapple in a fine sieve, working in batches if needed, and press to remove as much juice as possible. Add pineapple to pimento cheese mixture and stir until combined. Transfer to prepared pan, scatter with reserved cornbread crumbs and bake until browned on top and bubbly, about 25 minutes.
Make ahead: Serve warm from the oven or at room temperature.