Croque Monsieur Breakfast Casserole

Ingredients

• 1 large loaf country-style bread, cut into 1" cubes
• 6 large eggs
• 1 c. half-and-half
• 0.25 c. Dijon mustard
• 4 tbsp. unsalted butter, plus more for pan
• 6 oz. shredded Gruyére (about 2 1/2 c.), divided
• 4 oz. ham, torn into 1" pieces, divided
• 0.25 c. (30 g.) all-purpose flour
• 2.5 c. whole milk

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