You can, but I don't recommend it. Wild rice has a great "crunch" and texture to it that holds up well to being in a casserole without getting mushy, so a blend of wild rice with long-grain rice is best for this recipe. I love the Rice Select blend because it contains brown rice and red rice along with the wild rice, and it has a great texture. It does take some time to cook though, so make sure to plan ahead! You can try brown rice, because that is typically firmer (and it's healthier!) than white rice, but white rice might not turn out as good. But if you give it a try please leave a comment below and let me know how it turns out!