Preheat oven to 400°F, butter 6 individual gratin dishes
Heat butter and oil in large skillet over medium-high heat
Cook shrimp 2 minutes per side until pink, don't overcook
Add garlic, cook 30 seconds until fragrant
Add wine and lemon juice, simmer 1 minute, remove from heat
Season with Creole seasoning, set aside with pan juices
Melt 4 tbsp butter in saucepan, whisk in flour, cook 2-3 minutes until golden
Gradually whisk in warm milk, adding ½ cup at a time
Add cream and wine, simmer 3-4 minutes until thickened
Whisk in Dijon, Creole seasoning, cayenne, nutmeg, salt, white pepper
Reduce heat to low, add cheeses in batches, whisking until melted
Add shrimp and pan juices to sauce, stir gently to coat
Divide among gratin dishes
Mix panko, Parmesan, melted butter, parsley, paprika
Sprinkle topping evenly over each dish
Place on baking sheet, bake 15-18 minutes until bubbly and golden
Broil 1-2 minutes if needed for browning, watch carefully
Rest 3-5 minutes before serving