Overnight Croque Monsieur Casserole - Martin's Famous Potato Rolls and Bread

"Overnight Croque Monsieur Casserole - Martin's Famous Potato Rolls and Bread..."

INGREDIENTS
1 Tablespoon Unsalted Butter, plus more to coat pan 1 Yellow Onion, roughly chopped (about 1 1/2 cups)
1 Tablespoon Unsalted Butter, plus more to coat pan 1 Yellow Onion, roughly chopped (about 1 1/2 cups)
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