Heat oil in a pot and fry shrimp, mushrooms and garlic and add Knorr Instant Chicken Stock until shrimp turns pink from 7 to 10 minutes, then remove from heat.
To prepare the white sauce, add the contents of Knorr Béchamel mixture pack into 4 cups of cold milk in a bowl and put on low heat and stir constantly until you get the required density, add the nutmeg and cream and remove pot from fire.
Add the sauce to the shrimp and mushrooms and stir well.