MAKE AHEAD NOTE: If not baking right away, cover tightly with foil and chill in refrigerator until the next morning.
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When ready to bake move oven rack to middle position and set oven temperature to 350 degrees. Once oven temperature reaches 350 degrees, place uncovered casserole in oven for about 45 minutes. Let rest at room temperature for 5 minutes then slice into 3 rows by 5 slices.