I love all kinds of sweet potato casserole for Thanksgiving, but I just can't stand pecans. So I created my own sweet potato casserole without pecans! Click through for the whole easy, delicious recipe. It's a southern-style sweet potato casserole with marshmallows AND a streusel topping. I won't say it's healthy, but the sweetness comes in at a low 227 calories per half-cup serving. It's vegetarian and gluten-free as well! This sweet potato casserole can be made with canned yams quickly, too.