This Sweet Potato Casserole is a holiday classic studded with chopped pecans, marshmallows, and a streusel topping that is pure decadence! Growing up in the south sweet potatoes always made an appearance during the holidays. There is something about eating this casserole seems to change my mood drastically. I can’t explain it, but there’s a sense of happiness when bitting into a sweet, warm casserole. It definitely makes the house feel and smell like the holidays!