The easiest way to reheat this easy stuffed pepper casserole recipe is to microwave your serving for 1-2 minutes. It may benefit from a little extra moisture, so add a splash of chicken broth or water first. You can also sautee your leftovers in a large nonstick skillet on the stove or bake them in a small dish in your oven at 350 degrees F for 5-6 minutes.