For even cooking, slice sweet potatoes as uniformly as possible, ideally 1/4 inch thick. Always drain excess fat from the ground beef before adding tomatoes to avoid a greasy filling. The casserole can be assembled up to 24 hours ahead and refrigerated before baking. Add 10 to 15 minutes to the covered bake time if cooking straight from the refrigerator. Leftovers keep refrigerated for up to 4 days and freeze well for up to 3 months.
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