Serve this as a dish at a potluck or your next family get together. This is hands down my favorite casserole. This was an invention between three different recipes. Lots of vegetarian and vegan recipes use sweet potato so that was the inspiration of adding sweet potato into the dish. The red bell pepper gave the dish a sweeter flavor and beautiful color.
Instead of sweet potato, try using butternut squash to alert the recipe. Also, I used shiitake mushrooms but you can use any other type of mushroom. Shiitakes have a savory flavor so it compliments this dish well.