Creamy Baked Stuffed Shrimp Casserole Southern Comfort

Ingredients

• 1 1/2 lbs (680g) large shrimp, peeled and deveined
• 1 tablespoon (15ml) olive oil
• 1/2 teaspoon (2.5ml) salt
• 1/4 teaspoon (1.25ml) black pepper
• 1/2 cup (113g) unsalted butter, melted
• 1 small yellow onion, finely chopped (about 1/2 cup)
• 2 cloves garlic, minced
• 1/2 cup (50g) panko breadcrumbs
• 1/4 cup (25g) finely grated Parmesan cheese
• 1/4 cup (5g) chopped fresh parsley
• 2 tablespoons (30ml) mayonnaise
• 1 tablespoon (15ml) Dijon mustard
• 1 teaspoon (5ml) lemon zest
• 1/2 teaspoon (2.5ml) Old Bay seasoning
• 1/4 teaspoon (1.25ml) salt
• 1/8 teaspoon (0.625ml) black pepper
• 1 tablespoon (15g) unsalted butter
• 1 tablespoon (7.5g) all-purpose flour
• 1 cup (240ml) milk (whole or 2%)
• 1/4 cup (60ml) heavy cream
• Pinch of nutmeg
• 1/4 cup (28g) shredded Gruyere cheese