Step 1

Preheat oven to 350 degrees.

Step 2

Melt butter over medium heat in a large nonstick pan. Add onion and cook until soft.

Step 3

Add garlic and cook 1 more minute.

Step 4

Sprinkle flour into pan. Cook and stir for 1 minute.

Step 5

Gradually whisk in heavy cream. Add Worcestershire sauce, Creole seasoning, red pepper flakes, and nutmeg.

Step 6

Stir in cheeses until melted.

Step 7

Stir in sour cream and spinach until spinach is wilted. Remove from heat and stir in shrimp.

Step 8

Transfer mixture to a baking dish. Bake for 15 minutes.